________ you understand this rule, you’ll have no further difficulty.
#80259
A
Once
B
Unless
C
As
D
Until
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_______ you sit in front of the computer all day while working, you’d better take exercise for at least an hour every day.
#32517
A
Even if
B
Even though
C
Now that
D
As if
_____ basic first-aid techniques will help you respond quickly to emergencies.
#31190
A
Known
B
Having known
C
Knowing
D
Being known
Our government has taken some measures to overcome the lack of electricity, but it may take some time _____ we have enough power．
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A
since
B
after
C
unless
D
before
Modern technology has brought us so much convenience--we can now do many thingsThrough we call the Internet．
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A
how
B
what
C
which
D
that
_____ I am concerned, Peru is well worth a visit.
#31281
A
Even if
B
In my opinion that
C
As is known that
D
As far as