Combine these pairs of sentences by using relative pronouns:
1. Many readers have used this card catalogue. It is very helpful in finding the titles of the books.
2. The picture is very beautiful. Tom is looking at it.
3. Do you know the dentist? He pulled Mary’s tooth yesterday.
4. The girl is my classmate. She is reading a magazine.
5. The acrobat is his uncle. We saw him on TV last night.
6. The man was Mr. John. I saw him.
7. I am looking for the boy. His shirt is blue.
8. The man is very friendly. His son is a friend of mine.
9. The books are on science. The books are on the desk.
10. The movie was interesting. We want to see it.
11. That is the boy. He broke your windows yesterday.
12. The doctor is famous. I visited him yesterday.
13. He is the young boy. His father is a famous writer.
14. He has just bought a table. Its surface is made of precious wood.
15. Nobody thinks of the poor workers. Their life is very hard.
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Cho hình bình hành ABCD. Đặt \(\overrightarrow{AB}=\overrightarrow{a}\); \(\overrightarrow{AD}=\overrightarrow{b}\)
Hãy tính các vecto sau theo \(\overrightarrow{a}\) và \(\overrightarrow{b}\)
a, \(\overrightarrow{DI}\) với I là trung điểm BC
b, \(\overrightarrow{AG}\) với G là trọng tâm \(\Delta CDI\)