Itisprettywellunderstoodcontro

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It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.

A．that

B．when

C．what

D．how

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_______life in a new country can be difficult, it can broaden a person’s view of the world.

A．While

B．Since

C．Because

D．As

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Mary decided to attend the party, _______ to see her friends whom she hadn’t seen for ages.

A．hoped

B．hoping

C．to hope

D．hopes

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-- Hello, I _______ to ask if I can book two tickets for tonight’s film.
-- Sorry, we’ve already sold out.

A．am phoning	B．will phone
C．phone	D．have phoned

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_______ in her graduation paper, Mary has no time to do a part-time job.

A．Having been burying	B．Having buried
C．To be buried	D．Buried

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How long do you think ________the car factory launches a new model?

A．will it be until	B．it will be before
C．will it be when	D．it will be that

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