Some experts have said that ________ children believe they can succeed, they will never become totally confident of themselves.

A．if B．since

C．once D．unless

He never thought that his success came ________ he least wanted it.

A．until B．since

C．when D．while

Besides, ________ well it is translated, the spirit of the original work is lost.

A．no matter how B．no matter what

C．no matter when D．no matter where

________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.

A．Since B．While

C．Unless D．Though

________ much advice you give him, he does exactly what he wants.

A．No matter B．Whether

C．Whatever D．However

I was wondering what to do with my car which won't start ________ a kind man offered to help.

A．while B．and

C．so D．when

________ my teacher didn't tell me directly, I still felt that I didn't live up to her expectation.

A．When B．Since

C．As D．While

________ he stops driving himself like this, he'll have a breakdown.

A．Until B．Once

C．Since D．Unless

Beijing is ranked first in terms of traffic jams and expenses for culture ________ Guangzhou is more open to peasant workers than Beijing and Shanghai.

A．when B．since

C．while D．because

________ I'm mistaken, I've seen that tall man at a party before.

A．If B．As

C．Unless D．When