56. Jim never accepts an                 (invite) to dinner.

57. I am looking forward to                 (receive) a letter from my new pen pal.

58. If it                 (not rain) this weekend, we will go bike riding.

59. --- I am going to Hainan next week.

--- Enjoy                 (you).

60. The students                 (go) to the Summer Palace if they don't have a test.

61. The old man fixed up these bikes                 (help) the poor children.

62. He has a bad                 (tooth). He should see a dentist right now.

63. Smoking is bad for our health. You'd better give up                 (smoke).

64. You shouldn't refuse                 (help) others. You will also need help some day.

65. Tony's mother is sick. He has                 (stay) at home and look after her.