35.By the middle of the 1920s the farther corners of the earth ______explored .

A. are 　　 　B. were 　　　 　　　C. have been 　　　 　D. had been

34.Climbing Mount Qomolangma ______great skills and ______not without risk.

A. requires , is 　　 B.requires , was　 C.required , are　 D. required ,were

33.　 If we want to __________the high pace of modern life, we had better learn to make the right choices about what and how we eat.

A.　　 keep in 　 B.　　 keep track of　 C.　 keep out of 　 D. keep up with

32. Only by doing more practice ______you learn to play the piano well.

　　　 A.　　 you can 　　　　 you 　　 C.　　 be able to you　 　　 D. are you

31. There is a wide variety of new music __________ in every corner of the world in the near future .　

A.　　 to discover　 B. to be discovered　 C.　　 to be discovering 　 D. discovered