He _______ to school by bus every day.

If he ________ harder, he’ll catch up with us.

Look at the boy running on the ground. Is it Davis?—It ______ be him. I saw him go to the teacher’s office just now.

I’m talking to you, Jack. Please listen to ______ carefully.

In the United States, ______ a car most people feel that they are poor. — Yes. Cars are the most important part of life to them. [ ]