---Look at the glasses on the desk. Are they David’s?---They belong to him. I saw him go out with glasses just now.
A little boy wrote _____ “u” and _____“n” on the wall.
--- Why do you often take exercise? --- _____ me keep fit.
--- We went to see the man who was in hospital yesterday. --- __________.
If H2 burn in O2, we can get _____.
The boy read the article ________ and found something important in it.