On Teachers’ Day, I sent a ________to my English teacher, and said “Happy Teachers’ Day” on it.  

  ----How’s Joy’s skirt?----Her skirt is more beautiful than__________.

 Is that your _______?

-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. 

We need lots of ________ every day．