A driver should __ the road when .
Public service advertisements are often run _____ free, and are ______ to educate people about health, safety, or any other issue which affects public welfare.
--- Shall I tell John about it? --- No, you _____. I’ve told him already.
I am in low spirits, because the money _______ I was going to buy Mum a present is gone.
We have to work hard; ______ we’ll lose the chance.
We ______ for one hour and a half and it is about time we ______ a rest.