______ is known to us all is that the old scientist, for ________ life was hard in the past, still works very hard in his eighties.

To pick up as soon as possible, Tom was advised to do exercise ________ a change in diet

Mrs. Wang teaches _________ music. We like ______ classes very much.

The old man __________ eats junk food, does he

The doctor advised the patient to give up smoking_____ his own health