21.A: Can you please mail these letters and postcards for me?
B: Sure. Did you address and stamp them?
B: You're welcome.
(A)Yes. Thanks for your help.
(B)I have ten letters.
(C)Where is the post office?
(D)The mailbox is in front of the post office.
22.A: Suzan went shopping again and bought herself another washing machine.
B: _________________________ Doesn't she know that a penny saved is a penny earned?
(A)I have had no news from her.
(C)She is not at home.
(D)Why does she keep wasting her money?
B: Could you give me some constructive advice on how to improve it?
(A)I have no time to read the book.
(B)I don't think your proposal will work.
(C)I am waiting for your answer.
(D)I will give you a piece of advice.
24.A: Do you know when the new traffic rules will become effective?
(A)It is ten past ten.
(B)So far so good.
(C)As far as I know, it is in January 2011.
(D)I know an efficient method.
25.A: Tom, you are looking down today. Is something wrong?
B: Yes. I had a quarrel with a colleague.
A: ____________________________ What did you quarrel about?
B: I don't want to talk about it.
(B)I know what to do next.
(C)Oh, that's too bad.
(D)Who told you about that?