A ______ to this problem is expected to be found before long.
#5340
A
result
B
response
C
settlement
D
solution
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His latest research is at the   of genetic science. 
#5898
A
maiden voyage
B
cutting edge
C
focus group
D
daily basis
These tables and desks are all made of_____.
#7209
A
a wood
B
some wood
C
the wood
D
wood