That was the fourth time that Mr. Smith __________the Summer Palace.
A. has 
visited B. visits
C. had visited D. to visit
Americans and Canadians can understand each other ______ they don’t speak the same kind of English.
A. now that B. even if
C. as if D. only if
_____ of the students who took part in the military training _____ 450.
A. A number, is B. A number, are
C. The number, are D. The number, is
_________ people’s discussion and you will know a lot.
A. Join B. Join in
C. Take part D. Add up
—Excuse me，would you mind answering a few questions?
—Well，I don’t know. I’m in rather a hurry__________.
A. seriously B. actually
C. immediately D. quickly
The doctor told Jack’s mother that it would not take him long to ________ from his illness.
A. suffer B. separate
C. escape D. recover
