根据所给情景，从A、B、C三个选项中选出最佳选项。
1. — Can I take this seat?
— _______. It's for our teacher, Mr Li. [ ]
A. Of course
B. You'd better not
C. Yes, please
2. — You speak English well.
— _______. [ ]
A. Don't say so
B. Just so-so
C. Thank you
3. — There's going to be an exciting basketball match in our school.
— _______ I can't wait. [ ]
A. It's boring.
B. What a pity!
C. That's great.
4. — I have to make a speech at a meeting. I feel nervous about it.
— _______. I'm sure you can do it well. [ ]
A. Take it easy
B. Don't be so sad
C. That's all right
5. — What do you think of the math problem?
— _______. All of us can work it out. [ ]
A. It's a piece of cake
B. It's difficult
C. I hope so
