题目内容：

    We are warned by our teachers not to waste time because time _______ will never return. I think it quite _______. What does time look _______? Nobody knows, and we can’t see it or touch it and no _______ of money can buy it. Time is abstract, so we have to _______ about it.

Time passes very quickly. Some students say they don’t have _______ time to review their lessons. It is _______ they don’t know how to make use of their time. They waste it in going to theatres or playing, and _______ other useless things. Why do we study every day? Why do we work? Why do most people _______ take buses instead of walking? The answer is very ________. We wish to save time because time is ________.

Today we are living in the 21st century. We ________ time as life. When a person dies, his life ends. Since life is short, we must ________ our time and energy to our study so that we ________ be able to work and live well in the future. Laziness is the ________ of time, for it not only bring us ________, but also does other ________ to us. If it is necessary for us to do our work today, ________ we do it today and not ________ it until tomorrow. Remember that time is much more ________.

1.A.lost B.passed C.missed D.used

2.A.important B.true C.interesting D.usual

3.A.for B.like C.after D.over

4.A.amount B.quality C.quantity D.price

5.A.think B.imagine C.examine D.check

6.A.spare B.free C.enough D.much

7.A.that B.why C.because D.certain

8.A.doing B.making C.taking D.getting

9.A.needn’t B.have to C.had better D.would rather

10.A.easy B.simple C.stupid D.interesting

11.A.worthless B.priceless C.ready D.little

12.A.look upon B.agree C.think D.believe

13.A.spend B.give C.set D.devote

14.A.must B.should C.may D.would

15.A.helper B.thief C.friend D.teacher

16.A.wealth B.health C.failure D.illness

17.A.danger B.harm C.trouble D.difficulty

18.A.help B.make C.have D.let

19.A.keep B.remain C.manage D.leave

20.A.valuable B.expensive C.worth D.rich