1.Are there any .......... rivers left in the words? ( pollute) 2.It is ........ for beginning student to make mistakes in English ( avoid) 3.Even though 40 cars were involed in the accident, there were no serious.......( injury) 4.It is difficult to give a peech wihout ........( prepare) 5.Don't ........ me. I really want to come to your party but I can't ( understand) Giải thích luôn vs nha mn. Thanks nhiều

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