请在每题B句中每一空格内填写一个词，使A，B两句意思相同。

1. A: He is old enough to join the army.

    B: He is _____ old _____ he can join the army.

2. A: He is too young to go to school. 

    B: He is _____ old _____ _____ go to school.

3. A: The problem is so difficult that I can't work it out.

    B: The problem isn't _____ _____ _____ _____ to work out.

4. A: The bag is too heavy for her to carry.

    B: The bag is _____ heavy _____ _____  can't carry _____.

5. A: This pair of shoes is so dirty that nobody will wear it.

    B: This pair of shoes is too dirty _____ _____ to wear.

6. A: He isn't tall enough to join the team.

    B: He is _____ _____ _____  join the team.

7. A: I am very glad to do it for you.  

    B: I am _____ _____ glad to do it for you.

8. A: She hasn't enough time to do the work.

    B: She has _____ _____ time to do the work.