Was it 80 years before Christopher Columbus crossed the Atlantic ______ Zheng He hadsailed to East Africa? 
#84845
A
when
B
that
C
after
D
since
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It was the hurricane ______ was called Katrina ______ destroyed the city of New Orleans. 
#85437
A
which; that
B
what; which
C
which; who
D
that; which
—      the accident happened? — It’s said to happen on his way to work
#85436
A
Do you know it is where that
B
where is it that do you know
C
Do you know where it is that
D
where do you know it is that