单项选择题

That sound doesn’t （）in his language, so it’s difficult for him to pronounce it.

A. happen
B. occur
C. have
D. take place

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单项选择题
They demand to set up an organization flexible enough to cope with any emergency（）

A. portable
B. valiant
C. trivial
D. mobile
单项选择题
（）, the factories had not closed, and those who needed work most were given a chance to survive during the econmic disaster.

A. Unintentionally
B. Mercifully
C. Importunately
D. Tragically
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