His offspring are diligent and intelligent.
The clouds omen rain.
These clouds are ominous.
The typist omitted the last letter.
The street lights are usually turned on at 7:30.
The books are on the table.
I've been there more than once.
Once water begins to boil, its temperature no longer rises.
One day in May, she met a young man.
I don't have a pen. Can yon lend me one?
He went to see the doctor at the onset of a cold.
The window is made of opaque glass.
We revved up rehearsals for the opening of the play.
The cattle got out of the field through an opening in the fence.
My opinion is different from yours.
I have no opinion on that question.
We beat our opponents at football.
He socked his opponent on the jaw.
May I take the opportunity to express my thanks?
What a prodigious opportunity you have missed!