Unit 3 Life in the future grammar课时作业

一、单项填空

1. Catching ________ sight of their head teacher coming, the students fell silence in ________ flash.

A. the; the　 B. /; a　 　　C. the; /　 　D. /; /

2. If you want to slow down, you must ________ harder on the brakes.

A. take B. press C. sweep D. carry

3. Health problems are closely connected with bad eating habits and a ________ of exercise.

A. limit B. lack C. need D. demand

4. Many countries are faced with the problem about how to ________ economic development.

A. take up B. speed up C. get up D. stay up

5. I must ________ your promise ________ you won't be late again.

A. remind you for; why B. remind you to; in which

C. remind you of; that D. remind you; which

6. -Can you lend me your book on scientific achievements?

-You are not ________ to get this book from me, because I will read it soon.

A. possible B. likely C. perhaps D. probable

7. Don't worry. There's still time ________ a newspaper before the bus leaves.

A. left to buy B. leaving to buy C. left buying D. leaving buy

8. ________ I understand what you say, I don't agree with you.

A. When B. While C. As D. If

9. When a pencil is partly in a glass of water, it looks as if it ________.

A. breaks B. has broken C. were broken D. had been broken

10. This is the building ________ during the Qing Dynasty.

A. built B. to be built C. building D. being built

11. ________ by a greater demand for vegetables, farmers have built more green houses.

A. Driven B. Being driven C. To drive D. Having driven

12. ________ to reach them on the phone, we sent an email instead.

A. Fail B. Failed C. To fail D. Having failed