We'll learn much from this failure, so our suffering and efforts are not ________.
| A．in return | B．in vain |
| C．at random | D．at all costs |
—I guess I must leave now. See you tomorrow.
—________！ I have some important information for you.
| A．Hang on | B．Never mind |
| C．All right | D．Take care |
—I'm worrying about the coming examination. I'm afraid I cannot pass it.
—________！ I'm sure you'll make it.
| A．Go ahead | B．Good luck |
| C．No problem | D．Don't lose heart |
—Do you think I should accept the invitation to his birthday party?
—________ If I were in your shoes, I certainly would.
| A．None of your business. |
| B．Why not? |
| C．It depends. |
| D．I don't think so. |
—I forgot to bring my pen for the lecture.
—________. I have got a spare one.
| A．Go ahead | B．You're welcome |
| C．Not to worry | D．Don't mention it |
—I am going to Shanghai on a free trip this weekend.
—________
| A．Have fun! |
| B．It is none of my business. |
| C．You must have been cheated. |
| D．So what? |