Only after he had spent several nights working on the maths problem_______to wonder whether the problem was wrongly set.
A did he begin B, he began C, he did begin D, began he
—What's the man talking with Mr.Li over there?
—________.
| A．He is Tom's father | B．He is a dentist |
| C．He is from America | D．He likes playing football |
—I don't feel myself now.
—________
| A．Don't do that，please. |
| B．It's impossible. |
| C．What's the matter? |
| D．Why do you want to feel yourself? |
—Your house is very comfortable.
—________.
| A．Thank you |
| B．Oh，you are joking |
| C．Oh，no，not at all |
| D．Not as comfortable as yours |
—How do you like the film?
—________.
| A．I like it very much | B．I don't like it at all |
| C．It's very interesting | D．By understanding its plots |
—Oh，you sounded just like a native.
—________Why didn't you call us earlier?
| A．Good luck! | B．You did? |
| C．It's no surprise. | D．You are welcome. |