------Is Peter here yet? ------Not yet, but he ___________ be here soon. He is usually on time.

Overloaded with work, school teachers now get far less sleep than they ______.

Food safety is important. Rules____ to stop people from food pollution.

When we were young, every evening my brother and I ___ stay at home waiting for my mother?

That children ______meet with setbacks is a matter of necessity as they_____, so parents don’t worry about that.