--Bill, what’s your sister’s favorite         . --She likes volleyball best.

The baby has only two______.

And so_____people create so______traffic and pollution. 

The 2014 Winter Olympics was held in Sochi,        in February.

—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.