--Is it _____ pen? --Yes. It' s ______ orange pen. A a; a B. an; an C. a; an D. an; a
Don’t worry, Tom. We have ___________ to do homework.
Though my grandmother is old, her voice ______beautiful.
How long does it take you __________ your homework in the evening?
Diving is not as____ as skiing.
_________ does Jim surf the Internet? Once a week.