The policy of the mainland is very clear and straightforward，and the key problem is____

The policy of the mainland is very clear and  straightforward，and the key problem is_____the  leaders of Taiwan will accept it.

#30628

that

how

why

whether

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

#30254

Until

Once

Since

Unless

(2013·高考北京卷)Don’t turn off the computer before closing all programs，________you could have problems.

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and

but

 It’s only ten minutes ______ the meeting but he’s still not here yet.

#79853

for

till

______ is often the case in science, there is no simple answer

#31110

That

When

Where

______we don’t lose hope, there is still a chance for us to survive the snowstorm.

#33945

So far as

for fear that

So long as

As soon as