______ is not known what they discussed in the meeting.
A. That
B. What
C. This
D. It
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The government has promised to do _____ lies in its power to ease the hardships of the laidoff.
A. what
B. that
C. all
D. which
_______ percentate of working women in the United States has doubled since1940 has been the result of both economic and social factors.
A. The
B. That the
C. There is the
D. It is the
I never been to Beijing, but it's the place _______.
A. where I’d like to visit
B. in which I’d like visit
C. Imost want to visit
D. that I want to visit it most
There are signs _____ restaurants are becoming more and more popular with families.
A. that
B. whose
C. which
D. in which