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◎O◎
object
objective**
observe*
obtain**
obviously*
occasion*
occupation**
occupy**
occur*
ocean*
o’clock
October
odd*
of
off
offer
office
officer
official*
often
oil
OK
old
Olympics
on
once
one
onion**
online
only
onto*
open
opera*
operation*
operator**
opinion*
opponent**
opportunity*
oppose**
opposite
optimistic**
option*
or
orange
orbit**
order
ordinary*
organ**
organic**
organisation*
origin**
original*
other
otherwise*
ought to*
our
ours
ourselves
out
outcome**
outgoing**
outline**
output**
outside
outstanding**
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