下列句子中，每句有一个错误，请予以改正。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：必须严格按以上要求做题，否则无效。
1. They shook hands and kissed each other on their cheek.
2. Walking ahead and you’ll see the library on your right.
3. Who would you have to deliver the parcel?
4. Only then we realize how important friendship was.
5. The baby bent over, curious watching the red spider.
6. The teacher gave a series of example in her lecture in order that everybody could understand.
7. I have met him in several occasions, but don’t remember his name.
8. I’ve come with a message from Mr. Wang how he won’t be able to see you this afternoon.
9. The problem discussed now is about the newly-built canteen.
10. The boy lost his heart when he learned that he failed the exam again.
，a个—CH3，其余为—OH，则羟基的个数为 ( )