根据上下文，用括号内动词的适当形式填空。

         If you don't use your arms and legs for some time, they  1  (become) weak. When you start using

them again, they slowly become strong again. Everyone   2   (know) that. Yet many people don't seem to

know that memory  3  (work) in the same way.

        When someone says that he has a good memory, he really means that he keeps his memory in practice

by using it. When someone says his memory is poor, he really means that he 

 4   ( not give) it enough chance to become strong.

        If a friend says that his arms and legs are weak, we know that it is his own fault. (错误) But if he tells

us that he has a poor memory, many of us think his parents may   5  (blame), few of us  6  (know) that it

is his own fault. Have you ever found that some people  7   (read) or write but usually they have better

memories? This is because they can't read or write and they have to remember things. They can't write them

in a small notebook. They have to remember days, names, songs, stories, so their memory  8   (exercise).

       So if you want to have a good memory, practice  9  (remember) things in a way as other people  10   

(do).