It is very cold today. Mai, Phong, Linda and David can’t go to (21) ……. They have different (22)………problem. Mai has a flu. She should take some medicines and drink enough (23)…..Phong has a high fever. He has to see the (24) …….. Linda has a headache. She should stay at home and take a rest. My last classmate, David is  absent today. He has a (25)……. He has to go to the dentist. I hope my friends will get better soon.

17. A. the school               B. school              C. the park           D. playground

18. A. health                      B. doctor              C. a health            D. water

19. A. the water                 B. water                C. doctor              D. toothache

20. A. the school               B. health               C. the park            D. doctor

21. A. toothache                B. headache          C. fever                 D. playground