Fever is a ________of many illnesses. So I suggest you take it seriously and see a doctor as soon as possible.
Mary, I_____ John of his promise to help you.
I got this bicycle for______:My friend gave it to me when she bought a new one.
As he reached _____front door, Jack saw ______strange sight.
I have bought two ball pens ,______ writes well.
——I let my secretary call you several times. Do you know that? ——I _____in a meeting. I’m sorry.