单项选择题

As an assistant in a shop, she tries to be courteous at all times, even when she is very tired.()

A. straightforward
B. polite
C. flexible
D. neat

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The local government decided to merge the two firms into a big one.()

A. motivate
B. combine
C. compact
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Hundreds of buildings were wrecked by the earthquake().

A. damaged
B. shaken
C. fallen
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