6.His family is a happy one.

5.Chairman Mao lived in this room fifty-seven years ago.

4.In winter, it’s colder in the north than in the south.

3.They go to the U.S every other year.

2.The lecture is about the education of America.

10．我认为这样做是我的职责。

9．我们在温习功课，而他却在看小说。

8．我不仅喜爱运动，而且还喜爱音乐。

7．那位老人请一位年轻人扶他上公共汽车。

6．他的家庭是个幸福的家庭。