根据句意及首字母提示补全单词。

1. W         back to school, boys and girls.

2. I e           watching TV at night.

3. I feel h           .  I want a hamburger.

4. Do you often v       _ your grandparents?

5. I often w           to school on weekdays.

6. The room is so d          . Can you clean it for me?

机动车在高速公路上发生交通事故无法正常行驶时，用救援车、清障车拖曳、牵引。