请根据句意及提示，写出所缺单词。

1. He brushes his ________ (牙齿) and has a shower every morning.

2. —Are you b________ today?

    —No. I have nothing to do.

3. The Maths exercises are ________ ( not hard; not difficult) .

4. The car is very________ (have a high price) .

5. —Which month comes after September?

    — ________.