51. The son wants his mother _______ him up at six o’clock every day. A. to ring B. ring C. rings D. ringing ( )52. --- I often use Hotmail to send e-mails. --- Really? Would you please show me _______ it? A. how can I use B. what can I use C. how to use D. what to use ( )53. Tell the boy _______ out of the window. A. not to look B. to not look C. don’t look D. not look ( )54. Did you hear her _______ in the next room just now? A. singing B. sing C. to sing D. sang ( )55. How long does it take you _______ your homework every evening? A. finish doing B. finishing to do C. to finish doing D. finish to do ( )56. Have you decided _______ ? A. to go with whom B. whom to go with C. whom go with D. with who to go ( )57. Remember _______ the lights when you leave the office. A. to turn off B. turning off C. turn off D. to turning off ( )58. Her hope _______ the 2008 Olympic Games. A. to take part in B. is to take part in C. taking part in D. will take part in ( )59. The room isn’t big enough _______ so many people. A. holding B. hold C. to hold D. holds ( )60. You’d better not spend more time _______ computer games. A. for playing B. in playing C. to play D. plays