Will you help me to do the exercises? I don't understand the exercises

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2. Will you help me to do the exercises? I don't understand the exercises.
3. We haven't met Mr. Smith yet. His daughter studies with Paul.
4. We won't forget the day. We went to Big Bang's concert that day.
5. Peter has read the book. I recommended the book to him.
6. They sent me a postcard of the hotel. They stayed there on holiday.
7. This is my best friend. I met her at school ten years ago.
8. Is this the man? This man accused you of stealing his wallet.
9. Peter made a lemon cake. It is his speciality.
10. I want you to introduce you to Mrs. Black. Her husband is an engineer.
11. Can you show me the room? Meetings are held in that room.
12. I don't know the man. Sue is dancing with him.
13. We last saw Mary on Christmas Day. She came to our party then.
14. You have to correct the mistakes. You've made mistakes in the letter.
15. I like Mrs. White. She is in charge of the Marketing Department.
Exercise 7: Join the sentences to make relative clauses by using
suitable relative pronouns.
1. I have just greeted the girl. She is sitting next to my brother.