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．

80．concentrate(…)on专心于，聚精会神于

P1ease concentrate on the lesson．

79．cool off变凉，冷却，冷静

It cooled off after the downpour last night．

78．cheat…of骗取某人某物

He cheated me(out)of my money．