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She has never done anything for them, _______ they have done everything for her.
#30515
A
when
B
whereas
C
as
D
because
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We were having a meeting _________ suddenly someone knocked at the door.
#32482
A
because
B
when
C
as
D
while
 I was on the point of going to bed ________ Mr. Zhang rang me up.
#79867
A
as
B
when
C
while
D
and
Jane was dressed in red ______ Joe was dressed in blue.
#31817
A
however
B
when
C
while
D
as
A model or an experiment in a science class can help students see things which would ______ remain hidden.
#80029
A
otherwise
B
still
C
thus
D
therefore
_____ is known to us all is that to work hard to achieve a goal is more important than only to have a goal.
#33807
A
What
B
As
C
it
D
This