用括号内所给词的适当形式填空（每空不限一词）。

1. Eating too much sweet is bad for your ________ (tooth).

2. He is a ________ (honest) boy so we seldom believe what he says.

3. We Chinese will celebrate the ________ (ninety) birthday of the Chinese Communist

    Party (中 * * 党) in many ways.

4. In the modern world, people often contact each other by ________ (send) e-mails.

5. To keep healthy, I decide ________ (exercise) half an hour every day.

6. When traveling, you'd better take a map with ________ (you).

7. The students in Class 2 are having a ________ (discuss) about how to achieve a balance

    between study and play.

8. Though she answered the teacher's questions ________ (incorrect), the teacher didn't blame her.

9. More and more people have their own cars. That's why there's ________ (heavy) traffic than before.

10.—Why are you so happy today? —Because I ________ (win) the badminton match.