He has an obsession with postage stamps.
The word is obsolete.
Her father's opposition was their only obstacle.
She used to be as obstinate as a mule.
The road was obstructed by a fallen tree.
Knowledge may be obtained through study.
It is quite obvious that he is lying.
She likes an occasional glass of wine.
The occupant is not able to pay the rent.
My work occupied the whole morning.
At the beginning of June an event occurred.
When did the accident occur?
His behavior is odd.
That makes no odds.
He is easily offended.
They offered me a better position.
Thank you for your offer of help.
He made me an offer of 500 pounds for the house.
This will offset the loss.