--- Whose hat is this? --- I think it can’t be John’s or Kate’s. It’s much too small for __________.

My friend Tom comes from Canada and _______ is a tall boy with blue eyes.

These are ____  erasers,and _____ are  white.

The doctor told him that he should take a holiday to relax himself, but _________ didn’t help.

--What are these?  --_______ books．