It's really very dangerous.One more step，________ the baby will fall into the well.
#30469
A
or
B
so
C
but
D
and
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_______these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.
#32529
A
Since
B
Unless
C
Once
D
While
it has turned out, there was no need to worry about their safety.
#30589
A
While
B
As if
C
Now that
D
As
Life is like a long race___ we compete with others to go beyond ourselves.
#33091
A
why
B
what
C
that
D
where