__________ the English evening will be held has not yet been announced.
A. Where
B. Who
C. What
D. Whom
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It's strange __________ there are no lights on.
A. who
B. that
C. where
D. whoever
She will give __________ needs help a warm support.
A. whoever
B. wherever
C. whenever
D. however
__________ this is true or not, I really don't know.
A. If
B. Whether
C. How
D. When
Raw material is __________ we are badly in need of.
A. that
B. what
C. how
D. when