People in the southwest of China are in great need of ______ this year because it hasn’t rained for a long time there.

---How many _______do you have？　　　　　　---Let me see, my father has two brothers.  

--- Do you play a musical _____? --- Yes, I do. I started playing the piano when I was four. 

There are three ______ and seven _______ in the picture.

Li Lei is one of ________ in our class.