Mary was born in 1752 in a rich family in _____ is now the state of Virginia.
#31970
A
which
B
where
C
that
D
what
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Air pollution is getting more and more serious, so we must take action ________ it is too late.
#30412
A
before
B
after
C
until
D
when
He doesn’t plan to go back to his home________he makes a fortune in Hong Kong.
#30045
A
while
B
since
C
or
D
until
You needn’t take your shoes off when you enter someone’s house in Australia , _____ , of course , they’re very dirty .
#34326
A
before
B
since
C
when
D
unless
Most volunteers are from universities, _________ it is not uncommon to see middle and primary school students too.
#30378
A
though
B
however
C
since
D
even if
______ you are familiar with the author’s ideas, try reading all the sections as quickly as possible.
#32360
A
Now that
B
Ever since
C
In case
D
As long as