o'clock
October
of
off
office
officer
often
oil
OK
old
on
once
one
oneself
only
open
or
orange
order
other
out
outside
over
own
A soldier must obey the orders of his superiors.
Everything seems to be out of order in this city.
在這個城市每件事似乎都失去了控制。
I ordered a sandwich and a cup of Coke.
