-- Look at the boy running on the ground. Is it David?-- It _______ be him. I saw him go to the teacher’s office just now.
She________in her room at 9:00 last night.
What________you________when the rainstorm came last night?
I can’t find my pen.Could you help________find it?
Sally took a photo of her friends while they________computer games.
We all________to university next year.