1.People living in a city want to spend ______ time in traffic jams a.more b.less c.fewer d.much 2.Because of __________ poverty,Mumbai can be a difficult a.its b.it's c.his d.their 3.The population ___________ of London city is 5,590 people per square kilometer a.growth b.explosion c.density d.decline 4.Many countries have the problem of overpopulated cities,______? a.do they b.haven't they c.doesn't it d.don't they 5.___there are still thousands of homeless people living on the streets,it is fewer than in the past a.as b.though c.because d.while 6.Overpopulation is a serious problem which is ____ the world in negative ways a.facing b.solving c.causing d.affecting 7.we will be successful if we try hard,____? a.don't we b,will we c.won't we d.do we