4．1 hate _________at home on Sundays．A． stayingB． to stayC． stayD． stays
They went on ________ as usualA.workB.workedC.worksD.working
37_____A. happeinessB. sadnessC. loveD. hate
I____ not____at the moment. A.am workingB.is workingC.are workingD.working
I' m looking forward to()together with you.A. workedB. workC. working
The Chinese _____ hard－working. A. beB. beingC. isD. are
The commercial telephone service was no longer operative.A:creativeB:movingC:rotatingD:working
The subway system is no longer operative.A:running B:movingC:rotating D:working
The telephone system is no longer operative.A:running B:movingC:rotatingD:working
在MOST数据总线系统中， 把光信号变成电压，然后该电压被发送到MOST收发器。