________ hard you try，it is difficult to lose weight without cutting down the amount you eat.(2012·湖南)
A．However B．Whatever C．Whichever D．Whenever
—Since you like the car so much，why not buy it?
—________，I can't afford it.
A．As I like it much B．Much as I like it
C．I like it as much D．As much I like it
(2010·福建)The girl had hardly rung the bell ________ the door was opened suddenly，and her friend rushed out to greet her.
A．before B．until C．as D．since
(2010·新课标全国)Mary made coffee ________ her guests were finishing their meal.
A．so that B．although C．while D．as if
(2011·四川)As is reported，it is 100 years ________ Qinghua University was founded.
A．when B．before C．after D．since
I'm sorry you've been waiting so long，but it'll still be some time ________ Brian gets back.(2008·北京)
A．before B．since C．till D．after
