1. 用方框中所给单词或短语的适当形式填空，每个单词或短语限用一次。

introduce, invent, at a time, produce, spread

1. （1） Thomas Edison had many all his life.
3. （2） News could widely because of the TV and radios.
5. （3） You can only buy a bottle of water .
7. （4） Every year about 20, 000 cars are in this factory.
9. （5） We have to say the of the Internet has changed the world greatly.