--Is it _____ pen? --Yes. It' s ______ orange pen. A a; a B. an; an C. a; an D. an; a
—Amy has made great progress recently. —and .
— The key may be in your bag. —.
Why didn’t you get your hair?
I don’t think teenagers should go to bars.
— Do you believe there are aliens? — I’m afraid not. I don’t think aliens in space.