1. When I was walking in the street, I came across a friend of mine.
2. Do you know the person who is sitting at the table?
3. The man who is surrounded by students is my uncle.
4. The teacher is walking into classromm with a book in his hand.
5. He went to bed as soon as he finished his homework.
祝你学习进步,更上一层楼! (*^__^*)
不明白的再问哟,请及时采纳,多谢!