One-third of the country ________ covered with trees and the majority of the citizens _______ black people.

____ —Because they are very cute.

The workers in HuaShan Mountains have to rubbish to keep the mountains clean.

Not only _________ able to dance, but also _________ able to sing many English songs.

This is the same watch ______ I left on the playground yesterday.— How can it be possible? I bought _____ the other day