As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.
#31875
A
before
B
unless
C
since
D
until
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Charlie was a rich boy who had more toys than you could imagine. A time came when he was so used to all his toys __________ he began to want something different.
#31386
A
as
B
which
C
that
D
when
____ English is concerned, he is the best in our class.
#33646
A
As far as
B
As soon as
C
Now that
D
As
33. He waited until it was dark ____ nobody could see him clearly.
#79726
A
so that
B
in order to
C
although
D
However
Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
#31596
A
after
B
before
C
since
D
when