5.16.What has the speaker always felt proud of? A.His weight B.His good health. C.His wife's cooking skills. 17.What did the doctor advise the speaker to do? A.Lose weight. B.Do less exercise. C.Walk in the street. 18.Where did the speaker and his wife choose to walk? A.In a village. B.In a city. C.In a playground. 19.How did the speaker feel after his first day's walk? A.Very bored. B.Very sad. C.Very tired. 20.What did the speaker find after a month? A.He was happier than before. B.He was heavier than before. C.He was lighter than before.