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/focuson 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

They’re likely to drop out of school and less likely to succeed in life.

29.Eat one’s words 食言

30.Fall short of:达不到，不符合

Its results fell short of her expectation.（2002-1）