_________ the internet is _________, I do not think it is a good idea to spend too much time on it.

Jack Ma(Ma Yun), CEO of ALIBABA.COM，first touched a computer in 1995, _______ he visited a friend living in Seattle.
A. where             B. when             C. on which          D. that

Guilin is a beautiful place ______ you can enjoy yourself a lot.

------I’m worrying about my coming examination.
------Well, you will succeed in the end _______ you work with a strong will.

. He isn’t an honest man. You can’t believe anything ______ he says.

一Why did the policeman fine you yesterday?
一Because I drove my car at     the policeman thought was a dangerous speed．

Is this science lab ___ some foreign experts visited last Friday?              

—I finished all my work today．
—If____, you can help others with their work．

The news shocked the whole nation ____a strong earthquake hit Yushu on Apr．14, 2010．

---- I stayed awake _______ 12 o’clock to wait for my husband to come back last night.
------ Then you _____have had a good sleep, did you?