短文填空
选择恰当的词，并用其适当形式填空，使短文完整、通顺。每词限用一次。

Do you know machines? Now they are         used all over the world. Why are machines so important and            to us? Because they can help us do things faster and          .
A washing machine helps us to wash clothes. A printing machine helps us to        a lot of books, news papers, magazines and many       things quickly. Bicycles, cars, trains and planes are all         , too. They help us to travel faster than on foot. The computer is a wonderful machine. It was            not long ago. It not only stores（储存）information but also numbers（v.计算）millions of times as          as a scientist does.
Let's study hard and try to use all           of machines. I think we can build China into a          country in the future.