—Come on，Kitty.—Oh, good heavens! Both my legs are nearly to give out. I_______ for hours like a dog.

—I heard the peasants here        very poor in the past.—Yes,but there        great changes in the past few years.

 It was the third time that I ________ of the changes of the timetable.

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

He collected information on 1,000 people, whose IQ       when they were ten years old.