21.By no means ：绝不 /anything but
22.Check in/out
23.Come up：发生，出现，提出
24.Come up with：针对问题，挑战等提出，想出，赶上
I spent a whole week searching on the net， but came up with nothing valuable.
25.Concentrate on/focus on 集中
26.Deal with /cope with 处理
27.Drop in ：顺便拜访
28.Drop out of：不参与，退出
Theyre likely to drop out of school and less likely to succeed in life.
29.Eat ones words 食言
30.Fall short of：达不到，不符合
Its results fell short of her expectation.
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