用所给词的适当形式填空。

1.  The boys in my class are ______(cautious) not to make any mistakes in spelling than ever before.

2.  I am ________(negative) that you took down my number incorrectly.

3.  He has a real ________(enthusiastic) for teaching.

4.  She noticed a sudden _______(move)  behind the tree.

5.  They discussed the situation _________(private) .

6.  Scientists disagree about how the universe________(creative).

7. Such problems are a______(universe) feature of all ages.

8.  I suddenly lost my balance and fell _______(forward) .