79. My children are lucky_____________ the chance to visit the capital again.

   A. have                     B. having                    C. are having              D. to have

80. The children enjoy______________ with their friends through computers.

   A. to chat                 B. chat                        C. chatting                  D. chatted

81. Her father used to_______________ abroad for his business.

   A. travelling             B. travelled                 C. travel                      D. is travelling

82. The kids_____________ that show before.

   A. didn’t see            B. don’t see                 C. aren’t seeing           D. haven’t seen

83. How often______________ you______________ sports? –Twice a week.

   A. did-play               B. have-waited            C. do-play                   D. did-played

84. How long_______________ you_____________ for me?-For an hour.

   A. did-waited           B. do-wait                   C. have-waited            D. have-wait