用所给词的适当形式填空。
1. Daniel keeps two white _____ (mouse) as pets.
2. I ________ (receive) an email from my cousin two days ago.
3. I ________ (see) this movie before.
4. They used a knife ______ (open) the door.
5. This old man can use a computer _____ (do) word processing.
6. I don’t like watching football games. Let’s ______ (change) a channel.
