You should inspect the wheels regularly, and replace them ______ they cause you trouble.
A. while B. when C. before D. Until
He is always late for work, and yet nothing is ever said to him. I don't know how he___________ it.
A. cuts down B. gets away with
C. takes off D. turns up
Gun control is a topic ____________ Americans have discussed for a long time.
A. of which B. with which
C. about which D. into which
—Shall I give you a ride as you live so far away? —Thank you. ________.
A. It couldn’t be better B. Of course you can
C. If you like D. It’s up to you
The children who are crazy about playing computer games are all driven by _______ at first.
A. discount B. belief
C. curiosity D. Satisfaction
You will sound more polite if you ask _____________ a question.
A. in favor of B. in the shape of
C. in the form of D. in honor of
