Sam _____ some knowledge of the computer just by watching others working on it．
A．brought up B．looked up C．picked up D．set up
—Can you believe I had to pay 30 dollars for a haircut?
—You should try the barber’s I go．It’s only 15．
A．as B．which C．where D．that
Lots of rescue workers were working around the clock, supplies to Yushu, Qinghai province after the earthquake．．．．
A．sending B．to send
C．having sent D．to have sent
Mark have hurried．After driving at top speed, he arrived half an hour early．
A．needn’t B．wouldn’t
C．mustn’t D．couldn’t
——volunteering is becoming popular in China ．
——yeah, people are now aware that helping others is helping themselves．
A．naturally B．increasingly
C．splendidly D．successfully
We give dogs time, space and love we can spare, and _____, dogs give us their all．
A．in all B．in fact C．in short D．in return
