III. Вставьте вместо пропусков глагол to be или to have в соответствующей форме: 1.She ... a schoolgirl last year. 2. I ... many interesting text-books in the English language. 3. We ... Russian students. 4. Chemistry ... a difficult subject. 5. Our town ... many secondary and higher schools. 6. He ... a laboratory worker at a chemical plant before entering the institute.