- What? You have donated $10,000 to the disaster area9 - Oh, no, _______. I don't want to let anybody but you know it.

I think you should _______ some money _______ your friends.

---How long did it _____ you to work out the difficult maths problems?---I ______ about half an hour on it .

—How do you improve your listening skill, Mary?—I often do it _________ tapes and English radios.

----Linda,please _________how to get there and the cost of the trip. ------All right.I’ll make it at once.