21. While you are in hospital，we will keep you ________of the development of the project in time.
A．informed B．reminded C．warned D．accused
22. ______ a mobile phone for personal use ______ no easy task because technology is changing so rapidly.
A. Selects； is B. Selecting； is C. Selected； has D. Selecting； has
23. The boss ____ company I worked in two years ago has _________ in solving such kind of problem.
A. whose； many experiences B. who； many experiences
C. whose； much experience D. who； much experience
24. __________ hearing the news, all of us jumped with joy.
A. On B. For C. At D. Before
25. Mrs. Williams would never forget those days ____ she spent with Chinese students in China.
A. when B. where C. which D. what
26. I think we’d better a better plan after the meeting.
A. keep up with B. come up with C. catch up with D. put up with
27. There’s about 400mm rain fall(降水) in this area a year ________ .
A. on average B. in average C. of average D. for average
28. Most of his life has been devoted ___________ in a remote village.