With Shanghai World Expo drawing near, volunteers are making use of every minute to _______ their foreign language because language volunteers must pass a written test and an interview.
I __________ to stop their quarrel, but they wouldn’t listen to me.
A. succeeded B. advised C. managed D. tried
It is usually very cool in Tom’s hometown in September, but it ______ be rather hot sometimes.
A. must B. can C. should D. would