1,Overpopulation is a serious problem which is _____ the world in negative ways. A.facing b. solving c. causing d. affecting 2,Many countries ha
1,Overpopulation is a serious problem which is _____ the world in negative ways. A.facing b. solving c. causing d. affecting 2,Many countries have the problem of overpopulated cities, _____? a. do they b. haven’t they c. doesn’t it d. don’t they