单项选择题

Even if you are an experienced teacher, you sometimes () make some mistakes.

A. can
B. must
C. should
D. will

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- What are on show in the museum - Some pictures ()by middle-school students.

A. taking
B. having been taken
C. taken
D. being taken
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Two middle-aged passengers fell into the sea.() , neither of them could swim.

A. In fact
B. Luckily
C. Naturally
D. Unfortunately
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