—The light in his office is still on. Do you know _______?—To prepare for the material(材料) the meeting will need tomorrow, I think.
-You look so worried, what’s wrong? -More and more people like me begin to worry about the ______ pollution after the haze (雾霾) appeared in Beijing and some other cities in China.
The iPad isn’t ______. It belongs to ______.
Look ! There’s ______ football under the teacher’s desk. Let’s play ________ football, OK?
-I’m going on a trip to Japan after the exam -Really? ___________!
—How often ______ your school sports meeting ______? — Once a year.