21.By no means :绝不 /anything but
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
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）