Question

阅读短文，并用括号内所给动词的适当形式填空，必要时，要加助动词或情态动词等；答案请写在短文后1-10小题空白处。

Scientists  1  (try to)make the deserts into good land again．They want to bring water to the deserts，so people  2  (1ive)and grow food．They  3  (1earn)a lot about the deserts．But more and more of the earth  4  (become)desert all the time．Scientists may not   5   (be able to)change the deserts．Scientists think that people make deserts．People are doing bad things to the earth．

Some places on the earth  6  (not get)very much rain．But they still don’t become desert．This  7  (be)because some green plants are growing there．Small green plants and grass  8   (be helpful to) dry places．Plants   9  (not let)the wind blow the earth away．When a little bit of rain falls，the plants hold the water．Without plants，the land   10  (become)a desert much more easily．

Answer 1

1 are trying to；2. can live；3. are learning；4. is becoming；5. be able to；6. don’t get；

7. is；8. are helpful to；9. don’t let；10. can／will become