For my homework I have to write a(n)        about the wonders of the world.

There are three ______ and seven _______ in the picture.

Can you tell us how important wildlife ___ is?

—I like _________. It’s my favorite fruit. —You do? I like watermelons. 

—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.