—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.
—We can use QQ to talk with each other online. —Really? Could you show me ______it?
—What is your best friend like?. —He is a helpful student. He often helps the teachers _____ papers.
We ____ the last bus and didn’t have any money for taxi, so we had to walk home.
He is listening _____, but he can ____ hear anything.
—Do you know the boy ____ is playing soccer there? —Certainly, he is a friend of my _____