用方框内所给单词或短语的适当形式完成短文（有一项多余）

difference    only    be interested in    how    touch    much

    Do you often visit museums? Museums are often full of interesting and beautiful things, but in most museums you can look at the things; you can't them. This is not very interesting for most of us. People want to touch things. They want to use them and play with them. That is we learn about things. If we something, we learn about it more easily. But some museums are quite . For example, at the Boston Children's Museum，young people can use computers and other modern machines. They can also move and play games there. In this kind of museum, boys and girls feel very happy. They can learn a lot at the same time.