tìm và sửa lỗi sai:
1. my father's car (a), that (b) is very old, uses (c) too much gasoline (d).
2, thank you for (a) your letter which (b) you asked me what we are doing (c) when the earthquake occurred (d).
3. Sharon, who must (a) be intelligent, studies (b) very hard (c) , musn't (d) she?
4. Internet is becoming a necessary (a) tool of mordern (b) society so (c) it brings about many benefits (d) to people's life.
5. This novel, which (a) is quiet interested (b), is written (c) by an unknown (d) author.