—What’s your favorite ________, John?—Swimming，of course.

—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.

---- Could you tell me something about the boy who helped you just now? ---- Sorry, I know nothing about him, we are _____.

__________about the earthquake in Sicuan keep everyone in deep sorrow.(悲痛)

----I hear you have to get up early every morning . ----Right . It is one of the _______ in my family .