---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.
Bruce_____ football, but he is on the volleyball team now.
I still remember the museum_______ we visited last year.
— I will take an English test tomorrow. — Oh, really?________!
— On summer nights, the weather is usually hot at night in the south of China. — Yes, so I often go to sleep ______ the window ________.
You can’t go to the mall with John,he has got his driver’s license.