Unit 2 Saving the Earth
词句巩固练习
I.单项选择。
1.— How long ________ you ________ here?
— For about two years so far.
A.have; studied B.did; live C.do; stay D.were; swimming
2.We have known each other ________ ten years ago.
A.for B.ever C.about D.since
3.There is ________pollution in the world. We must stop it.
A. much too B.too much C.many too D.too many
4.The boss made child laborers ________12 hours every day.
