51. All students_______ wear uniforms at school because it is a rule.
A. Should B. have to C. ought to D. must
52. You ______finish your homework before you go to bed.
A. Must B. have to C. should D. ought to
53. This drink isn’t beneficial for health. You_______ drink it too much.
A. Should B. ought to not C. ought not to D. mustn’t
54. This warning sign indicates that you______ step on the grass.
A. Shouldn’t B. mustn’t C. don’t have to D. ought not to
55. I think you_______ do exercise regularly in order to keep your body good shape.
A. Must B. should C. ought to D. Both B and c
56. I will lend you some money, but you ________pay it back to me next week.
A. Should B. have to C. must D. mustn’t
57. Hoa _________feed the cats because her mother has done it already.
A. Has to B. doesn’t have to C. must D. Both A and c
58. Those audiences ________ show their tickets before entering the concert hall.
A. Have to B. must C. ought to D. don’t have to
59. The children _________ spend too much time playing Computer games.
A. Mustn’t B. ought to not C. shouldn’t D. Both B and c
60. In case you’re suffered from the injury, you ________see the doctor today.
A. Had better B. must C. ought D. have better