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
单项选择题 A:Something important has come up.（） B:Can it wait? I’ll be through in ten minutes.
单项选择题 We can make the new research an（）priority.
单项选择题 This result（）my research, Can you see it?
