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42 She doesn't know ＿＿＿ .
A. when to do
B. what to do
C. how to do
D. where to do
［答案］ B.
［析］ when, how, where均为疑问副词，而what为疑问代词，又因do是及物动词需要宾语。如用疑问副词时应为when to do it, how to do it, where to do it.
43 Must older people ＿＿＿ to politely.
A. speak
B. spoken
C. be spoke
D. be spoken
［答案］ D.
［析］ 这句话的主动语态应为People must speak politely to older people对年龄较大的人讲话应有礼貌。
44 Teachers usually ask their students ＿＿＿ loudly in class.
A. to speak
B. speak
C. speaks
D. spoke
［答案］ A.
［析］ ask somebody to do something 要求某人作某事。
45 - Where is Mr Zhang?
- Look! He ＿＿＿ on a big machine over there.
A. works
B. worked
C. is working
D. has worked
［答案］ C.
［析］ 由look, liston等词开始的句子一般要用现在进行时态。
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