She doesn’t know________．

The possibility _________ we won’t produce enough goods troubles everyone here.

It _______ law for some people to let the children who are not old enough ____ in the factories for them.

Excuse me. I want to buy some stamps. Where can I find a post office?—I know _______ is not far from here. You can easily find _______.

Would you like some coffee? — Yes, please. By the way, do you have any milk? I prefer coffee _____ milk. [ ]