His whole school education ________only 2 years because of his illness.
We should try to do as many _______ things for the environment as we can.
He is said _______ for the International Criminal Police Organization for many years.
He was sent to Australia _______ when he was ten years old.
Though he had tried to swim across the English Channel, he didn’t _______.
I don’t know why he has been absent _______ class for so long.