Not having worked out the problem, _____ leave the office．
A．so he was not allowed to B．and he didn’t want to
C．the teacher couldn’t make him D．he couldn’t free himself to
----Why isn’t Cathy here yet?
--- She _________ to be picked up at the station．
A．could wait B．must wait
C．might be waiting D．can be waiting
Don’t give up regardless of difficulty and failure, you’ll never achieve your goals.
A．and B．but C．or D．so
--- Have you got any books on English grammar? I’d like to borrow .
--- Yes, here you are. But you must return it by Friday.
A．it B．one C．some D．any
David got a higher grade in the final exam, for, you see, he made mistakes.
A．few B．fewer C．little D．less
I suggested to my mother that she a drawing club after her retirement form teaching.
A．join B．joins C．joined D．would join
