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1. today our lectures don't begin at 10 o'clock in the morning. 2. we weren't school-children last year. 3. we didn't have four entrance exams in summer. 4. yesterday the first-year students didn't see the institute laboratories. 5. we didn't take all the necessary books from the library. 6. i didn't get excellent marks for my entrance exams. 7. he don't know the meaning of the word «engineering». 8. the students of our group won't meet in the laboratory. 9. the librarian didn't give us all the necessary books.