(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

He had no sooner finished his speech________ the students started cheering.(2011·辽宁)

A．since  B．as

C．when  D．than

He smiled politely ________ Mary apologized for her drunken friends.(2012·山东)

A．as  B．if  C．unless  D．though

(2013·重庆，25)________ we have enough evidence，we can't win the case.

A．Once  B．As long as  C．Unless  D．Since

(2013·四川，7)He is so busy.He cannot afford enough time with his son________he wants to.

A．even if  B．as if  C．because  D．before

(2013·陕西，18)I have heard a lot of good things about you ________ I came back from abroad.

A．since  B．until  C．before  D．when

(2013·山东，28)________I have to give a speech，I get extremely nervous before I start.

A．Whatever  B．Whenever  C．Whoever  D．However

(2013·山东，26)Mark needs to learn Chinese________his company is opening a branch in Beijing.

A．unless  B．until  C．although  D．since

(2013·辽宁，24)One can always manage to do more things，no matter________full one's schedule is in life.

A．how  B．what  C．when  D．where