38. They did the       (實(shí)驗(yàn)) in the classroom yesterday.

39. Fanners shouldn’t use too many       (化學(xué)品) .They are not good for us.

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3. (2014廣東東莞南開實(shí)驗(yàn)學(xué)校期中，45, ★★★ ) —Excuse me. Could you tell me       ?

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8. —Do you drink much coffee as before?

  —No,       at all.My sleeping problem is getting worse.

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15. What a nice day!We should go sightseeing       watching TV in the hotel.

   A. because of   B. instead of

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48. It is not easy        (learn) a foreign language well.

49. The water here is safe        (drink) .

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 It rains very little and the reservoir             now.

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