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