---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.
Look at _________ eraser on the floor.
We _____ more than 1,600 words since we began to learn English.
We have a lovely room. It’s one of _____ in the hotel.
I have been to London. I _____ there last month.
— Could you tell me how _____ cakes? — Sorry, I don’t know.