You can take any seat _____is free .   
#72956
A
where
B
which
C
that
D
in which
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There are two small rooms in the house, _____ serves as a kitchen
#73480
A
the smaller of which
B
the smallest of which
C
the smaller of them
D
the smaller one
.— I wonder if you _______ a picnic tomorrow.— Yes. But if it ______, we’ll visit the museum instead.
#41003
A
have; rains
B
will have; rains
C
have; will rain
D
will have; will rain
David can speak idiomatic American English and yet, _____ English, he doesn't know it at all. 
#73915
A
how to teach
B
when it comes to teaching
C
when he teaches
D
however he teaches