We’ll be away for two weeks because we’ll have a _____.

My mother cooks dinner for us every day. We don’t need to do _______ before dinner.

— Eric, did you see my dictionary?— Sorry, Amy. But you can use           . I’m not using it at the moment.

Nowadays scientists are working hard to find out ______ to do with air pollution.

 — When do you usually take a walk?—______ the morning.