______we were worried about was ________they could manage to control the pollution.
#69123
A
That how
B
That whether
C
What that
D
What whether
______ come into leaf or bloom is obviously a sign of spring. 
#69125
A
Trees
B
The trees
C
That trees
D
What trees
You can use a large plastics bottle, _________ cut off, as a plot to grow flowers in.
#69130
A
with its top
B
the top of which
C
whose top
D
its top is
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