— What do you mean when saying every minute counts?
— A man who dares to waste one hour of time _________ the value of life.
A. hadn’t discovered B. hasn’t discovered
C. didn’t discover D. isn’t discovering
The young couple _______ as volunteer teachers for a whole year during their stay in Yunnan.
A. have worked B. had worked
C. worked D. have been working
________ a man realizes that his father was right, he usually has a son who thinks he is wrong.
A. After B. Until
C. The moment D. By the time
— You are so kind, honey, but I prefer a beautiful dress.
— OK. ___________.
A. You’ve got me there B. You name it
C. You have the last word D. You are pulling my leg
“The young man _________, but he chose to stay and help me,” Prather told CBS News. “I say thank you to him every day.”
A. could have left B. must have left
C. could leave D. must leave
Medical errors and various infections, if _________, will be the third leading cause of death in the world.
A. being combined B. to combine
C. having combined D. combined
