I was reading attentively in my own room ________ suddenly he knocked at the door.
#33711
A
when
B
while
C
then
D
as
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It is by no means clear ________ the president can do something to end the strike.
#30079
A
whether
B
which
C
that
D
what
There are no easy answers to questions brought to us by the rapidly changing world, we can try to turn challenges into opportunities．
#31140
A
so
B
but
C
for
D
then
Nowadays the belief has become common ______ sea food and fruit rich in vitamin C should never be eaten at the same meal.
#33304
A
that
B
how
C
when
D
/
________ you read English easily, you'll find it is another cup of tea to make conversation in English.
#30295
A
So long as
B
As soon as
C
Even if
D
Only if