This morning I saw an old friend of mine in the street by ______.
#5509
A
event
B
accident
C
affair
D
matter
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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
I suggested that we break off for tea in a(n) _____to reduce nervousness
#7254
A
attempt
B
thought
C
preparation
D
expectation