How many people will come to Beijing next year?—It’s hard to say.people ,I think.

I called you at 4:00 yesterday afternoon, but no one answered.—Sorry, I ______ with my friends at that time.

He goes to sleep ___his bedroom light ____ every day.[ ]

Tina， is this schoolbag? ——Yes，it’s mine.

How many teachers are there in your school? —I’m not sure about it. Maybe.