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23. He wrote the article ____ three days.   A.at       B.in        C.on      D.by

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22. He will return____ three o'clock.      A.after    B.in     C.on      D.at

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21. He went to Beijing and returned ____ three days.

A. in      B. before        C. later          D. after

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20. He will come ____ three days.           A.before     B.after    C. in      D. later

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19.The PLA man saved the boy ____ death.     A. of    B.from     C.to     D.on

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18.The group is made up____five students. And they are studying hard to make up____ the lost time.

A.of,of        B.for,for        C.of,for         D.for,of

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17.The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother.

A.for,on       B.on,for         C.for,for        D.on.on

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16. Fresh air is good ____ your health.     A.at         B.for        C.of     D.to

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15. It's very kind____ you to repair the bike ____ me.

A.for.for     B.of,of          C.of,for         D.for,of

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14. We go to school ____ a bike.     A.in    B.on     C.by       D.ove

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