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).
