It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.
#30830
A
since
B
before
C
after
D
when
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Junk messaging has been a headache for years, ＿＿the action taken by the authori-ties has not yet produced the results expected
#30981
A
as
B
but
C
so
D
before
________ there are living creatures in the outer space as those on Earth hasn't been proved until now.
#30306
A
How
B
When
C
Where
D
Whether
Professor Tang didn’t give us a speech today．It was he had a traffic accident on the way to school．
#32446
A
that
B
when
C
why
D
because
I have been keeping that photo ________ I can see it every day, as it always reminds me of my college days.
#80273
A
which
B
where
C
whether
D
when