What you are saying is nothing but building a castle in the air.
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He built castles in the air all day.
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To live without air is impossible.
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Oxygen from the air dissolves in water.
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Tiny particles in the air can cause cancer.
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Because of the problem of air pollution, the bicycle may some day replace the automobile.
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Air is a mixture of gases that we cannot see.
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Air is invisible.
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Air is a mixture of several gases.
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Air, like food, is a basic human need.
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The air was infected with photochemical smog.
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Air is a mixture of gases.
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The air is a medium for sound.
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The air is soft, the soil moist.
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Air is a mixture of various gases.
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Air is indispensable to life.
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As for the air, there is always some moisture in the atmosphere, but when the amount increases a great deal, it affects the light waves.
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Air quality has deteriorated these past few years.
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The idea that air has weight was surprising to the child.
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We cannot live without air.
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Both air and water are indispensable for life.
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If it were not for air and water, we could not live.
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Without air and water, nothing could live.
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Air is to man what water is to fish.
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If it were not for air, we could not live on the earth.
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The balloon descended gradually as the air came out.
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The air became warm.
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Were it not for air, no creatures could live.
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No living thing could live without air.
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Without air, nothing could live.
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We would die without air.
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But for air, nothing could live.
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It is clear that we cannot live without air.
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If there were no air, man could not live even ten minutes.
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If it were not for air, we could not live.
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But for air, all living things would die.
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Without air there can be no wind or sound on the moon.
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It is difficult to shoot a bird flying in the air.
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There is nothing like air travel.
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Nothing is so pleasant as traveling by air.
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Air travel is fast; sea travel is, however, restful.
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In this harsh, petty world where money does the talking, his way of life is like a breath of fresh air.
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Air is to us what water is to fish.
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People who regularly work in the open air do not suffer from sleeplessness.
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A balloon was floating in the air.
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It is foolish of you to build a castle in the air while forgetting to drive in pilings for its foundation.
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Air the futon.
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The air felt a little cold.
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The air by the sea is pure and healthy.
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There was an air of excitement at the meeting.
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We take air and water for granted.
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We talked over Jack's plan to put in air conditioning, but could not come to a decision.
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Our holiday plans are still up in the air.
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The very air we breathe is polluted with smog from the factory chimneys.
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Flowers and trees need clean air and fresh water.
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Houses should be built so as to admit plenty of light as well as fresh air.
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Music surrounds our lives like air.
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The smoke ascended into the air.
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The smoke is rising in the air.
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There are rumors in the air.
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There is no air in space.
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The doctor advised a change of air.
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I'm thinking of going somewhere for a change of air, since my doctor advises me to.
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The streets are filled with an air of exoticism.
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The committee called on all nations to work side-by-side to curb air pollution.
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Let's sing a patriotic air.
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Our plans for the vacation are still up in the air.
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London air was not much to boast of at best.
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Air as well as sunlight is, needless to say, indispensable to our daily life.
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If it were not for air and water, nothing could live.
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If it were not for air and water, nothing alive would exist.
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If it were not for the air, planes could not fly.
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If Sue is coming by air, she ought to arrive very soon.
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If I go by air one more time, I'll have flown in an airplane five times.
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It will soon be possible for us to go direct to New York by air.
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The decision was still in the air.
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I put on an air of interest.
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The ball bounced high in the air.
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Boeing's safety experts have joined others in the industry to form an international task force to try to eliminate one particular kind of air crash known as controlled flight into terrain, CFIT.
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The football game is now on the air.
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The boomerang hurtled whistling through the air.
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The cold air revived Tom.
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The smell of roses hung in the air.
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That's because the bubble vanished into thin air.
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The date of the party is still up in the air.
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There is an air of resignation everywhere.
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There was a slight chill in the air.
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Wouldn't you like to get some fresh air?
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Cigarette smoke fouls the air in a room.
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Let this smoky air out of the room and let some fresh air in.
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Let this smoky air out of the room and let some fresh air in.
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Even if pigs were to fly in the air, I would believe her.
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An ostrich does not fly through the air.
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If you pump air into a tire it expands.
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I must put some air in the tire.
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Fill the tires with air.
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The tire leaks air.
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The USSR will only use air strikes in the country as a last resort.
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It is concerned with air pollution.
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It is like the air we breathe.
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Does the room have air conditioning?
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