Itisnotuntilrecentlythescienti

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It is not until recently ______ the scientists have found proof of there being water on Mars.

A．when

B．that

C．how

D．what

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He wrote to his friends ______ information.

A．asked for

B．to ask for

C．ask for

D．asks for

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Old McDonald gave up smoking for a while, but soon _____ to his old way.

A．returned	B．returns
C．was returning	D．had returned

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What _____ to Joan last night? What did she cry for?

A．was happened	B．happened
C．was happening	D．had happened

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_____ is the population of your country?

A．How

B．what

C．How many

D．How many

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Please say "Hi" to Bob ______ me.

A．to

B．for

C．about

D．from

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