You can pay now or ______ you come back to pick up the bike.
A. then B. when C. while D. as
Tom, who had expected how it would go with his son, had a great worry ____ his mind.
A. on B. in C. with D. at
There is no experience you can have ______ is more exciting than skating on real ice.
A. of which B. what C. that D. with whom
BMW’s boss _____ the decision to fire 8,000 employees, saying the group needed to continue cost-cutting.
A. witnessed B. advised C. defended D. adopted
Mr. Black left for Beijing this morning, his secretary ______ him there this Friday.
A. joins B. joined C. joining D. to join
--- The fog is so thick that the express way ____ have been closed.
--- You are right. I ____ have thought of that. Now we have to take another road.
A. can; should B. may; can C. should; must D. must; should
