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20. I don’t think he could have slept well last night,__________?

  A. do I         B. could he          C. has he          D. did he

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19. ----Shall I give you a ride as it is so late?

  ---- Thank you. __________ .

   A. It’s up to you  B. It couldn’t be better  C. It all depends     D. If you prefer

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18. ________ change your mind, do let me know.

A. If should you  B. Should if you       C. Should you        D. You should

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17. _____ no need for us to discuss the problem again _____ it has been settled.

A. It has; once     B. It is; because       C. There had; for          D. There is ; since

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16. Some plants are so sensitive _____ pollution that they can only survive in a perfectly clean environment.

A. from         B. with             C. against           D. to

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15. ---_______ you have an accident, who will look after you?

  ----Can’t you look after me, dear?

A. Talk         B. Say          C. Speak            D. Discuss

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14. The pond has been _______ a terrible smell for a month but nothing has been done.

    A. calling in          B. setting up       C. giving off        D. giving in

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13. _______ in his book, he didn’t notice me _____ I entered the room.

A. Devoted; when      B. Absorbed; while  C. Absorbed; when    D. Devoted; while

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