16. The computer program is a puzzle to me. The more I think of it, the more questions I think of _____.
She raised her finger to her lips as _____ for silence.
Shortly after the accident, _____ police were sent to the spot to keep order.
We already have ______ pencils, but we need two ______ pens.
Jim is ______ person, and everyone is willing to be ______ with him.
By all _______, you must try every _______ to help him.