9.Well,stop chatting. It's time we_______________ (開始)some serious work.

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12. —I met your uncle on my way to school this morning.
―Ah? You _________ be joking. He flew to Germany yesterday evening !

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20. Head coach Li Yan bursts into tears of joy when she sees Zhou Yang first     the finish line at the women's 1 , 500m short track speed skating

final.

A. to cross      B. having crossed

C. cross      D. crossed

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7.  She did not have enough s _______ to walk upstairs because she was ill.

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4.     I won't have you _________________________ (作弊而不受懲罰)in the exam.

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4.    即使我們在防止污染方面取得了很大的進(jìn)步,然而需要做的還有很多。

_____________ we have made much progress in preventing pollution, yet much remains _________________ .  ( even though)

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6. ―What does the sign over there say?

―No person   bring drinks into the student computer room.

A. will    B. may

C. shall    D. must

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3. Nuclear science should be developed to benefit the people __________ than harm them.

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8. —What sort of house do you want to have? Something big?
~ Well. it ______ be big―that's not important.

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