Put in as or like.
Dosym worked ____ a waiter on his holidays.
Can I use this saucer ___ a plate?
The children jumped and squealed ___ little puppies.
My little daughter behaves ___ a grown- up person.
___ your doctor , I advise you to stop smoking.

Dosym worked __as__ a waiter on his holidays. Can I use this saucer _as__ a plate? The children jumped and squealed _like__ little puppies. My little daughter behaves _like__ a grown-up person. __Like_ your doctor , I advise you to stop smoking. As_ your doctor, I advise you to stop smoking. Оба варианта возможны.