80,on the dot =准时,正点

-Did you and a man Amanda really meet exactly five minutes to two in front of the theater?

Yes, we were both there on the dot

81,on earth =究竟,到底

-How on earth can you believe that?

82,on end = 连续,没完没了的

-Did Linda ever finish that introductory chapter?

I am not sure; she spent hours on end rewriting it

83,on one's own =独立的,凭自己的力量

-She learned to use the computer on her own

84,on sale =减价

-Did you buy any of the sweaters that were on sale?

Buy any, I got five of them, there were such a good bargain

85,on campus =在校内

-Michel is the most talented actor on campus

Isn’t he though?

86,on the side =兼职,副业

-He has a job on the side preparing a libratory every day for the next experiments

87,once and for all =最后一次,干脆

-I am going to tell that neighbor of mine to turn down that music once and for all

I see why you are angry, but I've always found that the polite route is the most effective

88,out of =缺乏,没有

-I'd like to buy a copy of professor Franklin's book on shelves shells(贝壳)

I am very sorry, that you’ve been out of print for some time now

-The bookstore is out of textbooks for France 102

-How can we be out of salt, I bought them only last week

-The bookstore is out of lined notebook paper 划线的笔记本

89,out of business =停止,停产

-The supermarket down the street is selling everything half price because they are going

Out of business

Sounds like an idea time to stock up on coffee

90,out of earshot = 不在听力所及范围

-Hey, Joe, Joe, save your breath

He’s out of earshot

91,out of it =神情恍惚,心不在焉

-Peter's really out of it these days

Yeah I know, ever since he met Anne, he’s been in another world

92,out of one's mind =神经失常

-Gerry says he's planning to take an extra course this term

He’s got to be out of his mind

重点阅读：

新东方托福：

新东方托福培训视频：

托福辅导：