在下列各句的空白处填入一个最恰当的单词，使句子意思完整，语法正确。

1. There will be a big exam tomorrow, and I havc to ________ up late tonight.

2. It's very cold today.  I'll stay at home to watch TV _______ of going out.

3. I don't think teenagers should be allowed to drive without a driving _______．

4. It's _______of you to spend too much time on computer games.

5. My sister got her ears ________ to make herself more beautiful.