— 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’m sorry I didn’t make it to your party last night. -- ______, I know you’re busy these days.
There is no doubt that IT plays___important role as a new teaching tool in this era of___technology.
Although this medicine can cure you ______ your illness, it has a bad effect ______ you.
After he graduated from college, he _______ his father’s business.
Both rice and wheat _______ grown in our country.