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

 Every possible means ______ to prevent the air pollution, but the sky is still not clear. 

There ___________some milk and many hamburgers on the table.

 I seldom eat sweet snacks because there ______ too much sugar in them.

The headmaster and secretary as well as the teachers      discussing LiBai’s New Selected Poems that      published last month.