3．火车跑得越来越快了。

　 The train is running ___________ and ___________.

2.今天美国仍有大量的树木在继续被砍伐。

Today, too many trees are still being _______ ______ in the USA.

1.绿色长城将阻止风刮走土。

The Great Green wall will _______ the wind ______ blowing the earth away.

5.The PLA was ___________(建立)on August 1, 1927.

4.Our knowledge of the universe is __________(增长)all the time.

3.Most business letters around the world are _______ (写)in English.

2.There were about 1,700 million people in the world at the ________ (开始)of the 20th century.

1.___________ (邮票)are used for sending letters.

5.Machines are used for making things.(就画线提问)

________ _______ machines used for?

3.We must finish homework on time.(改为被动语态)

Homework ______ ______ _______ on time.

you tell me how I can get to the park?(改成同义句)

Can you tell me ______ ______ _____ the park?