When astronauts return to the earth’s atmosphere, helicopters fly to________they would land, ready to collect them.
#34720
A
what
B
where
C
which
D
that
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Many people claim that they have seen UFO with their own eyes, _____ I personally doubt.
#34387
A
that
B
which
C
when
D
where
It would be unfair to clone any extinct animals they were to live in a zoo.
#34232
A
or
B
if
C
but
D
whether
What an unforgettable experience! I’ll write it down ______ it is still fresh in my memory.
#31336
A
since
B
while
C
after
D
until