One third of the country________covered with trees and the majority of the citizens________black people. 

–Hi, I ____ Tony. _____ you Helen?      -- Yes, I am.

Not only I but also Jane and Mary ______tried of having one examination after another.

I want to know all negative effects the Internet           our lives.

Huge quantities of information ________available on the internet, but whether the information ________ reliable needs to be further proved.