(     )31.—How do you like the film?

—I am sorry.I _________ it yet.

A.didn’t see    B.haven’t seen   C.don’t see

(     )32.Doing eye exercises _______ well in _______ our eyesight.

A.work,protect              B.work,protecting  

C.works,works protecting

(    )33.We have finished _________ of the work.We will have to finish the rest by tomorrow.

A.two thirds          B.three fifth          C.third seconds

(    )34.As we know,overpopucation has become one of _________ in the world today.

A.the grestest problems         B.the greatest problem

C.the smallest problems