They often paly _______  on the badminton court.

— I hear you have to run for half an hour every day.— Right. It is one of the            in my school.

This piano is too big. Can you made_______ for it?

-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. 

My uncle’s son is my     .