two thirds of the land (be )covered with tree

two thirds of the land (be )covered with tree (About two thirds) of the earth is covered with water. two thirds of the land are covered by water 这句话有何错误 ______ of the land in that district ______ covered with tree Two fifths of the land in that district ( ) covered with tre two of the land is covered with trees and grass是什么意思 About two thirds of the Earth's surface is covered by the se I have covered two-thirds of the book. i will return it tomo The land is covered with water. ——of the land in that country——covered with trees and grass. 3.___ of the land in that district ___ covered with trees an _____ of the land in that district_____ covered with trees a