题目内容：

If you do not use your arms or your legs for some time, they become weak: when you start using them again, they slowly become strong again. Everybody knows that. Yet many people do not seem to know that memory works in the s1. way.

When someone says that he has a good memory, he really means that he keeps his memory in practice by u2. it. When someone else says that his memory is poor, he really means that he does not give it enough c3. to become strong.

If a friend says that his arms and legs are weak, we know that it is not his own fault （错误）. But if he says that he has a poor memory, many of us think that it is just his o4. fault.

Have you ever f5. that some people can’t read o6. write but usually they have better memories? This is b7. they cannot read or write and they h8. to remember things; they cannot write them d9. in a little notebook. They have to remember days, names, songs and stories; so their memory is being exercised the whole time.

So if you want to have a good memory, learn f10. the people: practice remembering.