20. — We are going to have a singing party tonight. Would you like to join us?— ________A. I'm afraid not, because I have to go to an important meeting.B. Of course not. I have no idea C. No, I can’t. D. That's all set【答案】A。21. — How was your trip to London, Jane?— ________A. Oh, wonderful indeed. B. I went there alone.C. The guide showed me the way. D. By plane and by bus.【答案】A。22. — Hey, Tom, what's up?— ________A. Yes, definitely! B. Oh, not much.C. What is happening in your life? D. You are lucky.【答案】B。23. — Do you mind my smoking here?— ________A. No, thanks. B. Yes, I do. C. Yes. I'd rather not. D. Good idea.【答案】B。24. — Did you know that David injured his leg yesterday?— Really? ________A. Who did that? B. What's wrong with him?C. How did that happen? D. Why was he so careless?【答案】C。25. — This box is too heavy for me to carry it upstairs.— ________A. You may ask for help. B. I'll give you a hand.C. Please do me a favor. D. I'd come to help.【答案】B。