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【单选题】
It took meexactly a week to complete the work．A.
start
B.
achieve
C.
finish
D.
improve
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【简答题】A．Put the homework on Don's desk. B．Leave the key for Don. C．Give Don's students the next assignment. D．Call Don at the end of the afternoon.
【单选题】Class regulations require _____ is the last to leave the classroom _____ off all the lights.
A.
who; should turn
B.
whom; shall turn
C.
whomever; turns
D.
whoever; turn
【单选题】Students who leave school in the spring and look for work are one source of ________.
A.
structural unemployment
B.
cyclical unemployment
C.
frictional unemployment
D.
business-cycle fluctuations
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