---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.
—What is her telephone number?—__________.
—Please sit down. —_____________.
—_______you spell “pen”? —P-E-N, pen.
—What _______is your bag? —It’s yellow.
I am a student. ________name is Tom.