A.half of them | B.half of which | C.half of whom | D.half of who |
A.how can I know | B.how I ought to know |
C.why shall I know | D.why I should know |
A.on which | B.in which | C.to which | D.with which |
A.which | B.why | C.that | D.whether |
A.which | B.where | C.what | D.when |
A.where | B.which | C.in that | D.in which |
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