聽短文填空。
If you do not use your arms or your legs for some time, they become weak. When you start using them,
they slowly become strong again. Everybody knows that. But many people don't know that 1______ works
in the same way. When someone says he has a good memory, he really means that he keeps his memory in
practice by 2______ it. When someone else says that his memory is poor, he really means he doesn't give it
enough 3______ to become strong. Some people can't read or write, but usually they have better memories.
This is because they have to remember things; they cannot write them down in a notebook. They have to
remember days, names, songs and stories; so their memory is being exercised the 4______ time. So if you
want to have a good memory, you have to 5______ remembering.
