根据下列各句句意及所给单词的首字母或汉语提示，写出该单词的正确形式。
1. Prices have risen by an ______（平均） of 4% over the past year.
2. It sounded like a ______（合理的）
enough excuse to me.
3. It’s important to ______（区分） between business and pleasure.
4. She has a lifestyle which most people would ______（嫉妒）.
5. Drunken driving can be ______（惩罚） with a prison sentence.
6. Two points in this report are especially ______（值得的） of notice.
7. The little girl drew a ______（正方形） on the paper.
8. “May I ______（陪伴） you to the ball?” he asked her.