IV. Choose the word (a, b, c, or d) that best fits each of the blank spaces. How can we keep our teeth (21) ______? Firstly, we ought to visit our (22) ____ twice a year. Secondly, we should brush our teeth (23) ____ a toothbrush and fluoride toothpaste at least twice a day, once after breakfast and once before we go to bed. We can also use toothpicks (24) _____between our teeth after a meal. Thirdly, we (25) ______ eat food that is good (26) ______ our teeth and our body: milk, fish, brown bread, raw vegetables, fresh fruit, etc. 21. a. health b. healthy c. healthily d. unhealthy 22. a. dentist b. doctor c. teacher d. engineer 23. a. on b. of c. by d. with 24. A. clean b. to clean c. cleaning d. to cleaning 25. a. should b. ought to c. need d. a & b 26. a. for b. at c. on d. to V. Read the following passage and choose the item (a, b, c, or d) that best answers each of the questions about it. A: Hi. Can I help you? B: Yes, please. Could I have something fpr a cough? I think I’m getting a cold. A: Well, I sugest a box of these cough syrup. And you should get a bottle of vitamin C, too. B: Thank you. And what do you have for dry skin? A: Try some of this new lotion. It’s very good. B: OK. Thanks a lot. 27. What does the word ‘cold’ in line 2 mean? a. low temperature b. not hot or warm c. a common illness d. not heated or cooked 28. The first speaker suggested that the second speaker should buy_____. a. a box of cough syrup b. a bottle of vitamin C c. a new lotion for dry skin d. all are correct 29. The second speaker is a_______. a. patient b. doctor c. dentist d. nurse 30. They are talking in a______. a. theater b. stadium c. drugstore d. dentist’s 31. Which of the following is not true? a. Vitamin C is good for a cold. b. Cough syrup is good for a cough. c. There is a new lotion for dry skin. d. The second speaker doesn’t want to buy the new lotion.