o. This type of machine is A. the most 17. You A. mustn't to 18. ONG MAI SECONDARY SCHOOL - 61 B. most B. aren't must A: "What are you doing this afternoon?" B: " economical than that one. D. much A: " B: "Go straight then turn left on the second turning. The post office is on the right." A. "Could you tell me the way to the post office?" B. "Can I borrow your phone?" C. "What is a post office?" D. "Where is the post office?" 19. A. I am visiting my grandma this afternoon. B. I always visit my grandmother in the afternoon. C. It's very nice to listen to music in the afternoon. D. I don't know what you are talking about. C. more climb on that wall. It is very dangerous. C. mustn't 99 D. don't must C¬ E