_____ in the library regulations that any book borrowed be returned by due time, or the borrower will be fined．
#78012
A
What is required
B
It is required
C
As is required
D
Which is required
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My father and his teacher talked a lot about the things and persons ___ they could remember.
#77622
A
who
B
which
C
what
D
that
Have you ever been to Mount Huangshan, ___________is famous for its pine forests and "sea of clouds"?
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A
what
B
where
C
that
D
which
The singer hopes her concert will be like a big party ________ everyone enjoys themselves.
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A
which
B
when
C
what
D
where
The Big Ben, _______ we visited during a recent trip to Britain, is one of London’s tourist attractions.
#77484
A
which
B
what
C
that
D
where