Do you know _______ of the three?
A. which book she likes best
B. which best book does she like
C. that which book she likes best
D. which book she best likes
I hear _______ the teacher will come back from the UK soon.
A. which
B. that
C. when
D. whether
Can you tell me _______ language she speaks?
A. which
B. what
C. that
D. whether
Can you tell us _______ you grow cotton in your country?
A. that
B. whether
C. which
D. whose
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