— 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
The little boy saved every coin __________ he could buy his mother a present on Mother's day.
People often mistake some __________ objects such as kites or balloons for UFOs.
—Did you happen to see __________ black and __________ white cat? —Are they missing? I told you to take care of them.
Newspapers reported the news; __________, I think that's all nonsense.
If you __________ my advice, you __________ your failure now. You __________ your victory.