86. Ho Chi Minh city is bigger than Da Nang. A. Da Nang is smaller than Ho Chi Minh city. B. Da Nang is larger than Ho Chi Minh city. C. Da Nang is smaler than Ho Chi Minh city. D. Da Nang is more small than Ho Chi Minh city. 87. Remember to bring a compass, if not we will get lost in the forest. A. We mustn’t bring a compass, if not we will get lost in the forest. B. We must bring a compass, if not we will get lost in the forest. C. We can bring a compass, if not we will get lost in the forest. D. We will bring a compass, if not we will get lost in the forest. 88. Drinking alcohol when driving is prohibited. A. You mustn’t to drink alcohol when driving. B. You must alcohol when driving. C. You mustn’t drink alcohol when driving. D. You mustn’t drinking alcohol when driving. 89. Watching TV is more interesting than reading books. A. Reading books is less boring than watching TV. B. Reading books is boringer than watching TV. C. Reading books are more boring than watching TV. D. Reading books is more boring than watching TV. 90. It is wrong for us to go to school late. A. We must to go to school late. B. We must go to school late. C. We mustn’t go to school early. D. We mustn’t go to school late