---David, why are you so excited?---My father has made a ______that he will take me to Tibet next month..
Can you please spend _____ explaining it _____ us?
—I’m too busy. Could you do_______ to help me? —Of course. I can do_______ for you if you want me to.
—Do you enjoy traveling by air?—No, it’s ________ expensive.
He was _____ at the _____ news.
The young man rushed into the house ______ the baby in the fire.