90．hang up挂上电话；挂起来

After she finished her conversation，she hung up．

Lester hung up his hat and coat．

89．set foot in／on踏上，走进

Never set foot on our property again．

88．focus on聚集于，集中于

Focus your attention on your work．

87．fix up安装

They are busy fixing up the lights．

86．feed on以……为主食

It feeds on a certain kind of fish．

feed…on用……喂养

What do you feed your dogs on?

85．drop out(of)辍学；中途退出

If you don’t like the idea, drop out．

84．dream of／about梦想；想到

I never dream of its hurting you．

83．clean up收拾；整理

You should always clean up after a picnic．

82．account for说明原因解释

He couldn’t account for his absence from sch001．

81．take…into consideration考虑到

These were a11 factors which hed to be taken into consideration．