--- Hey, Mary, your backpack looks nice. When did you buy it.
--- I ____ it for two weeks.
A. had B. bought
C. have had D. have bought
The snowstorm ________ our difficulties.
A. added to B. added up
C. added up to D. has added
．Why do you insist on buying a car ______ you have such good public transportation here?
A. because B. unless
C. when D. though
Thomas wants to know ______Nina lives.
A. where B. who
C. what D. if
Mr. Smith couldn’t open the door because his naughty boy _______ it from the inside
A. would lockB. was locking
C. has lockedD. had locked
．When you don’t know a word, you can _________ in the dictionary.
A. look it up B. set it up
C. give it up D. pick it up
