At the end of a designated period, the person with the envelope can keep the money.

The person should keep the eye open as wide as possible.

A person can keep only so many problems and concerns in his or her head or heart at any one time.

But the person at the other end of a phone call has no idea what is happening on the road and keeps chatting.

But if a person keeps doing it, how many times can you get away?

"One person keep shouting, to make sure we don't lose the way."

Even a person of her endurance couldn't keep this up much longer.

"If everyone else wanted me, why would they let one person keep me out?"

The person on the far right will keep his head straight.

Maybe the right person kept quiet to stir up an incident.