7.我妈妈越忙碌就越是感到高兴。

_________ _________ my mother is，_________ _________she feels！

6.这儿每年都要栽成千上万棵树。

Here _________ _________trees _________ _________every year.

5.他还年轻，你必须阻止他抽烟。

He is_________. You must _________him_________ _________ .

4.他说他下个月才回来。

He said he_________ _________ back_________ _________month.

3.自从两年前这些医生和护士来到这儿，他们拯救了许多孩子的生命。

These doctors and nurses have _________a lot of_________ _________since they came here two years_________.

2.一份联合国的报告表明,到二十世纪末,全球人口将超过六十亿。

A UN report says the world _________will _________six _________by the end of the _________century.

1.所有的学生都在忙于准备数学测验。

All the students are _________ _________ _________ for the _________test.

15. If Mg _________in O2, we_________ MgO, and it _________ a combination reaction (化学变化).

A. will burn; get; calls

B. burns; will get; called

C. will burn; can get; is called

D. burns; will get; is called

14. _________is bad for our health.

A. Doing eye exercises　　 B. Going to bed early

C. Eating too much　　　　 D. Taking a walk after supper

13. Reading English aloud _________very important for students.

A. were　　 B. being　　 C. is　　　　　　　　 D. are