(2011·湖南)One－third of the country ________ covered with trees and the majority of the citizens ________ black people.

— How long have you known John? — Since he ______ to our class.

We would have avoided that terrible accident,        Jack, the driver,       too much that night.

— What were you doing when I phoned you last night?— I ______ my homework and was starting to surf the Internet.

—Are you still very busy？—Yes，I ______ the report for the manager and it won’t take long．