题目内容：

用括号内所给单词的适当形式填空。

1.My mother doesn’t allow me to go out at night because she worries about my_______ (safe).

2.Don’t eat so much ice-cream, or you will cough________ (bad) as usual.

3.In my class, not everyone’s hobby can________ (support) by their parents.

4.Changchun is known for ________ (produce) cars.

5.This piece of information is very useful. It is ________ (valuable ) than the other pieces.