4. There are over 100 students in our class. (改为同义句) 

There are             100 students in our class.

3. How many people are there in Shanghai? (改为同义句) 

      is             of Shanghai?

2. The population of China is over1,300,000,000. (对画线部分提问)

             the population of China?

There are three million people in the city. (改为同义句) 

The            the city       three million.

6. 你知道每分钟有多少婴儿出生吗？

 Do you know                     are born every minute?

5. 中国的人口约13亿。

The population of China is about             .

4. 在许多国家，人口增长是一个大问题。

               is a big problem in many countries.

3. 北京是一座大城市，人很多，噪音、车辆 (也) 很多。

Beijing is a       city,               people and              noise and traffic.

2. 我正在为一个报告准备一些资料。

I'm        some notes        a report.

1. 我们在这儿讨论它正合适！

2. We are                     to talk about it！