单项选择题

The professor worked for 7 hours at a ________.（）

A. stretch
B. extend
C. expand
D. prolong

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A year later，with the nation‘s economy ________， Bush’s approval rating dropped below 40 percent.（）

A. in power
B. in trouble
C. in hand
D. in part

单项选择题

Some persons gain goal and direction from their tensions others ________under pressure.（）

A.fall out
B.fall apart
C.fall back on
D.fall in with