题目内容：

 If you do not use your arms or your legs for some time, they will become weak; and when you start using them again, they will slowly become strong again.       knows this, but nobody would think of      the fact.

Yet there are many people who        to know that the memory works in the same way. When someone says that       has a good memory, he       means that he keeps his memory in practice      exercising it very     , either consciously or unconsciously. When someone else says that his memory is      , he means that he does not give it enough       to become strong. The position is exactly the same as that of       people, one of      exercises his arms and legs by playing ball, while the other       in a chair or a car all day. If a friend of yours says that his arms are weak, we know that it is his own       , But if he tells us that he has a poor memory,       of us think that his parents are to blame, or that he is just      , and few of us realize that it is just as it was his arms or legs that were weak. Not all of us can become very strong in body or very clever in mind,       all of us can improve our strength and our memory by the same means that      .

Have you ever       that people who cannot read or write usually have       memories than those who can? Why is this? Of course, because they cannot write down something in a little notebook or something else. They have to remember names, places, songs and stories; so their memory is always being exercised.

    In a word, if you want to have a good memory, do practice       things。

1.A. Everybody                   B. Somebody           C. Nobody         D. Each one

2.A. proving          B. questioning        C. describing              D. indicating

3.A. want            B. have                C. seem                     D. need

4.A. she                         B. he            C. it                     D. one

5.A. always            B. nearly       C. really             D. almost

6.A. with                        B. in                   C. to                                      D. by

7.A. often            B. fast                 C. quickly           D. soon

8.A. bad               B. useless             C. helpless                 D. poor

9.A. time            B. chance        C. space                D. places

10.A. two           B. four                C. three           D. five

11.A. them                  B. that          C. whom                    D. which

12.A. lies           B. sits          C. hides             D. stands

13.A. business       B. interest        C. story                D. fault

14.A. few                    B. some               C. many             D. several

15.A. unfortunate     B. unhappy         C. unthinkable       D. miserable

16.A. because               B. but          C. for               D. since

17.A. study                     B. rest          C. play               D. work

18.A. noticed        B. thought            C. believed          D. realized

19.A. stranger               B. poorer            C. worse                    D. better

20.A. remember             B. remembering.  C. to remember        D. remembered