-- 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.
There will be lecture (演讲) in half an hour.The meeting room with people.
Each of the studentsin the playground when the bell rang.
Do you know over there?
—What’s wrong? —I can’t find my watch.
—What’s this in the photo? —It’sUFO.I took the photo.