—Who _____ it be that is knocking at the door?
—It ______be father, but I’m not sure.
A. can; may B. may; can C. may; must D. need; should
You can't imagine _____when they received these nice Christmas presents.
A. how they were excited B. how excited they were
C. how excited were they D. they were how excited
The meeting was of _____, and the information he offered at the meeting was_____.
A. important; valuable B. great important; of valuable
C. great importance; valuable D. very important; of valuable
The reason_______ his coming to China was _____ he wanted to study Chinese medicine.
A. for, that B. why, that C. why, because D. for, because
I was really anxious about you. You _______ home without a word.
A. mustn’t leave B. shouldn’t have left
C. couldn’t have left D. needn’t leave
This book _____ ten units, _______ three main revisions.
A. contains; containing B.includes; including
C. includes; containing D.contains; including
