No one really knows exactly of when the first people arrived in we now know as California
A．where B．when C． what D．which
Traditionally, college students hold a graduation ceremony to encourage themselves when they are to _________ on their life journey.
A. set up B. set off C. set about D. set down
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
