单项选择题

The store had to () a number of clerks because sales were down.

A. lay out
B. lay off
C. lay aside
D. lay down

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单项选择题
Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first ()

A. intention
B. attempt
C. purpose
D. desire
单项选择题
Writing is a slow process, requiring () thought, time, and effort.

A. significant
B. considerable
C. enormous
D. numerous
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