1.绿色长城将会阻止风吹走泥土。

　 The Great Green Wall will _____ the wind _____ ______ the earth _____ .

12.Something must be done ____ ( make ) our environment better .

11.Don’t make the baby _____ ( cry ) .

10.The students are busy ____ ( get ) ready for the exam .

9. It took me two days _____ ( mend ) the car .

8. I don’t know if he _____ ( come ) back tomorrow .

7. More than twenty people ______ ( kill ) in traffic accidents since May .

6. Will you please _______ ( not turn ) on the radio ?

5. After the trees ____ ( cut ) down , they will be carried out of the forests .

4. The room should　 ________ ( keep ) clean and tidy .