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?

2.Bob isn’t a teacher. He isn’t a farmer, either.(改为同义词句)

Bob is ______ a teacher ______ a farmer.

1.“Can I try on the coat?” I asked.(改为带宾语从句的复合句)

I asked ________ I _______try on the coat.