单项选择题

We employ about seven hundred full-time people. But we（）causal staff when we need them.

A. check in
B. taken in
C. check out
D. take on

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单项选择题

A:Something important has come up.（）
B:Can it wait? I’ll be through in ten minutes.

A. Can you spare a minute?
B. Can it wait?
C. Sorry to interrupt.
D. Do you mind?

单项选择题

A. entire
B. obvious
C. expensive
D. absolute

单项选择题

A. proves
B. approves
C. welcomes
D. values