—You look so worried, what’s wrong?—More and more people like me become to worry about the __________ pollution  after the haze (雾霾) appeared in Beijing and some other cities in China.

The ________  on his face told me that he was angry.

You can’t turn right when you see the sign _______.                    

--- What’s _________ , Mary?   --- I have  _________. 

This is my room and that’s my_____ room.