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_______environmental damage is done, it takes many years for the ecosystem to recover．

A．Even if

B．If only

C．While

D．Once

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—How can I get more information about your products?
—_____ to call the sales office or visit our website.

A．Go ahead

B．You are wanted

C．You need

D．You are welcome

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---May I borrow your book Steve Jobs ?
--- ________ you return it before Friday.

A．If only

B．Unless

C．On condition that

D．Now that

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---Shall I give you a ride since you live so far away?
---Thank you. ____.

A．It couldn’t be better	B．Of course you can
C．If you like	D．If you are convenient

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E-mail, as well as telephones, _______an important part in our daily communication.

A．play

B．have played

C．are playing

D．is playing

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If you make every effort, your dream will ____, and this ____ all the people.

A．be come true; is true to	B．come true; is true of
C．realize; is true for	D．be realized; is true to

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