问答题 Complete the sentences with the correct comparative or superlative form of the adjective in (brackets).
1. A typewriter is ______ (cheap) than a computer.
2. IBM is the ______ (big) computer company in America.
3. A notebook computer is ______ (expensive) than a desktop one.
4. I think a desktop computer is ______ (good) than a notebook one.
5. In my opinion, a telephone is the ______ (important) piece of office equipment.
6. The ______ (fast) way to contact a client is by phone.