Why are your clothes always _______?

—Is that your father?—No. It’s my uncle, my mother’s _____.

 It’s important for us to have _________ food. It’s good for our ________.

—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.

We could hear the frightened people's _____ in the accident.