题目内容：

I. 用括号中所给词语的适当形式填空。

1.When you walk along the road, you must pay attention to the __________ (safe).

2.You’ll make mistake if you are ____________ (care).

3.A __________ (strange) stopped her on her way home.

4.They are taking a ride to the Great Wall ___________ (happy).

5.Danny was ___________ (serious) ill and he was taken to the hospital at once.