4.The doctor told me to take the medicine _______.　

A.every four hours B.each four hours　

C.every four hour D.every fourth hours

3.She was _______ when he heard the _______ news.　

A.excited;exciting B.exciting;excited　

C.excited;excited D.exciting;exciting

2.My brother used to be a very good basketball player.He was _______ the college team.　

A.for B.on　

C.with D.by

1.We don"t _______ children under the age of 15 to work here.　

A.let B.allow　

C.have D.make

10.He found it the suitcase very heavy to carry.

[答案] 去掉it

9.How about the two of us take a ride down the highway?

[答案] take改为taking

8.It is well known that the corn is a useful plant，which grows in warm places.

[答案] 去掉the

7.When he was young he was selfish and never helped other.

[答案] other改为others

6.We can produce more food by farming animals instead of hunt them.

[答案] hunt改为hunting

5.Many old buildings were torn down to make rooms for a new highway.

[答案] rooms改为room