________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
He smiled politely ________ Mary apologized for her drunken friends.(2012·山东，27)
A．as B．if
C．unless D．though
I don’t believe we’ve met before，________I must say you do look familiar.
(2012·新课标全国，25)
A．therefore B．although
C．since D．unless
It’s not easy to change habits，________ with awareness and selfcontrol，it is possible. (2013·重庆，23)
A．for B．or
C．but D．so
Don’t turn off the computer before closing all programs，________ you could have problems. (2013·北京，22)
A．or B．and
C．but D．so
