41．A. quickly             B. slowly            C. happily             D. shyly

40．A. laughed             B. smiled            C. stared             D. looked

39．A. made                B. prevented       C. kept                  D. let

38．A. entering            B. hiding            C. coming             D. turning

37．A. thought             B. interest              C. anger             D. surprise

36．A. school               B. wheelchair      C. home             D. hospital

35．A. walk                 B. run                   C. sit                     D. stand

33．Although they are tired, they still go on ______.

               A. working         B. to work            C. work                D. worked

32．―Do you know __________ since 2007?

  ―Let me see, oh about 1,700 words. 

               A. how many words have we learned                B. how many words do we learn

               C. how many words we have learned              D. how many words we learn