________ 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
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
He never thought that his success came ________ he least wanted it.
A．until B．since
C．when D．while
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
Our society insists on regular habits, timekeeping and punctuality, and whether we like it or not, ________ we mean to make our way in society, we have to comply (to act in accordance with a demand, rule, etc.) its demands.
A．whether B．after
C．if D．until
________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
A．Even if B．As far as
C．If only D．So long as
