— Look, it _____ be Jack who is at the gate of the library.It _____ be him. He has gone abroad.may; must B. must; mayn’t C. must; can’t D. can; mayn’t
I ______________ have passed my examination easily,but I made too many stupid mistakes.
Mom,don’t you think it's OK to play once in a while ____________ it doesn’t affect my studies?
— Is everyone here? — Not yet.Look,there ______________ the rest of our guests!
The boy was so tired that he fell asleep _____________ his mother could take off his clothes.
—Why not find a new job?—Why should I? I _____________ as much,but I like what I'm doing.