You don’t know ______ I want to see you again. It’s a year since I last saw you.[ ]

The principal is not here, and you’d better call him ______ 3 p.m. ______ 5 p.m. tomorrow. [ ]

_____pencil cases do you have? —One. []

To _________ nature is to help ourselves , or we will be punished.

Is that your model plane? — No, it’s his, is on the sofa.