______ is often the case with a new idea much preliminary activity and optimistic discussion produce no concrete proposals.
A. That
B. It
C. Which
D. As
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Angiosperms inhabit relatively diverse environments and may be found ______ higher plants can survive.
A. there
B. wherever
C. somewhere
D. anywhere
Twelve is to six ______ two is to one.
A. what
B. which
C. that
D. when
______, she knows French well.
A child as she is
B. Child as she is
C. As she is a child
D. The child as she is
______, they could find nobody in the house.
As they would search
B. Would as they search
C. Search as they would
D. They would search as
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