(    )37. It’s bad for our eyes to read books _______ the sun. 
             A. to                     B. under                      C. in                             D. over
 (    )38. —Watching TV too much _______ bad for your eyes. 
              —I’ll go to bed right away.
            A. is                       B. are                         C. was                          D. be
 (    )39. _______ necessary for us _______ English well. 
            A. This is; to learn   B. It’s; to learn            C. It’s; learn                  D. That’s; learn
 (    )40. —Humans can’t live _______ air. 
              —I agree with you.
            A. without              B. with                       C. in                             D. for