5．教室里只有站的地方了。

There is only ___________ ___________ in the classroom.

4．许多国家都向空中发射了人造卫星。

　 Man-made satellites have been __________ ___________ into space by many countries.

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.