David talked with a friend of ____ on the Internet for a long time yesterday.
—Mrs White always helps others _____ she is very busy. —She is so kind. A. but B. because C. although
—The population of the world ____ still ____ now. —So it is. A. are; growing B. will; grow C. is; growing
—It smells terrible. What has happened here? —Look, there is a chemical factory_____ much waste gas. A. pour B. pouring C. poured
In our class _____ of the students _____ girls. A. two fifths; are B. second fifth; are C. two fifths; is
—Where are Maria and Kangkang? —They _____ England. A. had been in B. have gone to C. have been to