Jack wasn’t saying anything，but the teacher smiled at him________he had done something very clever. (2011·湖南，33)
A．as if B．in case
C．while D．though
At school，some students are active ________ some are shy，yet they can be good friends with one another. (2012·四川，4)
A．while B．although
C．so D．as
I had hardly got to the office________my wife phoned me to go back home at once.
(2012·大纲全国Ⅱ，11)
A．when B．than
C．until D．after
—Coach，can I continue with the training?
—Sorry，you can’t________you haven’t recovered from the knee injury.(2012·重庆，30)
A．until B．before
C．as D．unless
________hard you try，it is difficult to lose weight without cutting down the amount you eat. (2012·湖南，32)
A．However B．Whatever
C．Whichever D．Whenever
Everything was placed exactly________he wanted it for the graduation ceremony.
(2012·天津，14)
A．while B．when
C．where D．though
