Living in the central American desert has its problems, ________ obtaining water is not the least .
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A
of which
B
for what
C
as
D
whose
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Between the two parts of the concert is a break, _____ the audience can buy ice-cream.
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A
when
B
where
C
that
D
which
Shy people often avoid situations would force them into close contact with other people．
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A
which
B
where
C
when
D
what
Alice received an invitation from her boss, ________ came as a surprise.
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A
it
B
that
C
which
D
he