________ unemployment and crime are high，it can be assumed that the latter is due to the former.
A．Before B．Where C．Unless D．Until
(2010·重庆)Today，we will begin ________ we stopped yesterday so that no point will be left out.
A．when B．where
C．how D．what
(2011·山东)He had his camera ready ________ he saw something that would make a good picture.
A．even if B．if only C．in case D．so that
I travel to the Binhai New Area by light railway every day，________ do many businessmen who live in downtown Tianjin.
A．as B．which C．when D．though
Jack wasn't saying anything，but the teacher smiled at him ________ he had done something very clever.(2011·湖南)
A．as if B．in case C．while D．thought
—Did you return Fred's call?
—I didn't need to ________ I'll see him tomorrow.
A．though B．unless C．when D．because
