31.The old artist is in the habit of going for a walk in the park every morning 【except】 it rains.
except 后面加 when
32.He went to the library and spent the whole afternoon there 【to look】 for material for an article on Shakespeare.
改为 looking
33.The book was so 【bored】 that I returned it to the library without finishing it.
改为boring
34.Jack was in the conference room discussing plans with the other committee members when the chairman 【had called】 to say he’d be late.
改为 called
35.Maradona,who led Argentina to their World Cup triumph in Mexicoin June 1986,is undoubtedly one of the greatest soccer 【player】 the world has ever produced.
改为 players
36.Paul suggested that they meet 【in the front of】 the school gate at one p.m.Friday afternoon.
改为 in front of
37.After 【making】 observations for a week,Sam found why Mr.Hobbs’ shirt factory was so
inefficient.
改为 having made
38.Since the beginning of this century,more and more scientists have become interested in
【the way】 how the human brain works.
删除the way 或者 删除 how
39.On his way to school yesterday morning Prof.Wang met an old friend and stopped 【talking】with him for quite a while.
改为 to talk
40.Not until my mother told me the sad news last night did I 【knew】 that our neighbor Dr.Li
was killed in a car accident the week before.
改为 know
【注】
因为无法辨认A、B、C、D对应的单词,所以只能这样修改.