—Betty, you don’t look well. What's wrong?----I have a fever.—______. You'd better go to see a doctor.
—Let’s visit the sick children in hospital and ______. —OK, let’s go.
—What are you listening to? —A song by Huo Zun. It ______ beautiful.
—I’m busy with my schoolwork these days. —That’s great! You won’t get good grades ______ you work hard.
—Whose pencil box is this? —It _____ be Tom’s. It has his name on it.
—______ do you surf the Internet? —About twice a week.