And too many people in a small place make 18 hard to keep th

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And too many people in a small place make 18 hard to keep thecities safe and clean.
And too many people in a small place make 18 hard to keep thecities safe and clean.Yet quiet a lot of people still 19 living in big cities.
18.A it B them Cthis Dthat
19A suggest Benjoy Cfinish Davoid

18 A
19 B
it 是形式主语,真正的主语是to keep thecities safe and clean；
enjoy doing 享受；喜欢做某事

And too many people in a small place make 18 hard to keep th 2.too many people in a small place makes it hard to keep the Many people find it hard to find a job.和 Many people find th Cat are very small and ___.Many people like to keep them as There were( )many people in the zoo ( )it was hard to get th 语法填空题Many people keep small fish ____1____ pets.They keep th many people like to keep small animal as their p____. We found ___ hard to study in such a noisy place.A.this B.th The hall is too small to ----- so many people Joe was 5th highest and 5th lowest in a race.How many people too many,too much,much too There are ()people in the hall.Th Many people belive that a bird's home and place to sleep is