二、单项选择(每小题1分，共15分)
21. ----How do you usually keep in ____touch with your friends ?
-----by _____email. It’s fast and convenient.
A. 不填；an B. the ; 不填 C.the;an D. 不填. 不填
22. I was chatting with my mother on the telephone _____we were suddenly cut off.
A. when B. who C. where D. while
23. As for some skills ,once ____them, you will never forget them, and this is what we call internalization.
A. Have grasped B. to grasp C. having grasped D. grasped
24. I have never been a rich person, but I have always been blessed _____good health.
A. to B. of C. with D. for
25. Believe it or not, the beautiful new car in front of my home ____to my neighbour.
A. belongs B. is belonged C. will be belonged D.is belonging
26 .-----Peter finished the difficult task on his own.
-----He ___me to help him, but he didn’t tell me anything when I met him yesterday.
A could have asked B. could ask C. must have asked D. must ask
