______is known to us all, only the theory ______ on practice can be practical.
#76757
A
Which; base
B
Which; based
C
As; based
D
As; basing
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There is hardly an environment on earth ______ some species of animal or other have not adapted successfully.
#77526
A
to which
B
in which
C
for which
D
on which
In a sport team each player has a clear role, and there are few occasions ______ members are confused or uncertain of their roles.
#76089
A
why
B
where
C
when
D
in which
I can hardly remember any occasions ____ I get caught in a traffic jam in our town．
#77204
A
which
B
that
C
where
D
when