根据句子意思，用括号中所给单词的适当形式填空。

1. Peter is much ______ (tall )than Kitty.

2. September is the ______ (nine) month of the year.

3. You should listen to your teacher ______ (careful) in class.

4. I would rather ______ (stay) at home than go shopping with you.

5. Sandy was ______ (happy) because she failed in the maths exam yesterday.