A survey of the opinions of experts ______ that three hours of outdoor exercise a week is good for one’s health.

A. show　　 　　　　　　 B. shows　　 　　　　　 C. showed　 　　　　　　 D. showing

 When he was working there he caught a serious illness from ______ efforts he still suffers. 

A. which                 B. that                        C. whose              D. what

No one knows when ______ that boy, but if she does, her parents will be disappointed.

A. she will marry B. she marries C. will she marry　　　　　 D. does she marry

 The flowers were so lovely that they ______ in no time. 

A. sold                   B. had been sold            C. were sold             D. would sell

 Mother told Jim to watch the milk until it boiled and then ______ off the gas.

A. turn                      B. turning                  C. turned                   D. having turned

 The telephone ______, but when I got indoors, it stopped.

A. had rung            B. was ringing          C. rings                   D. has rung

---May I go and play with Dick this afternoon, Mum?

---No, you can’t go out ______ your work is being done.

A. before B. until C. as D. the moment

 We must do something to stop factories ______ waste water into the river before it is cleaned.

A. pouring                   B. to pour                    C. poured                    D. being poured

 ---How did you do in the test?

---Not so well. I ______ much better but I misread the directions for Part D.

A. could do                  B. could have done       C. must have done               D. should do

We first met on a train in 2000.

We both felt immediately that we ______ each other for years.

A. knew　　　　　　　　　　　 B. have known　　　　　　 C. had known　　　　　　　 D. know