完成句子，使改写后的句子完整，并与原句意思相符，注意每空只填一个单词。

1. A computer is more useful than a VCD.

    A VCD isn't ______ useful ______ a computer.

2. John left school after he finished his homework.

    John ______ leave school ______ he finished his homework.

3. What does your father do?

    What is your ______ ______?

4. How clever the boy is!

    ______ ______ clever boy he is!

5. I'm a doctor. He's a doctor, too.

    ______ he______ I ______ doctors.