Вставьте нужную форму глагола to be1.Mathematics…very difficult. 2. Our football team…winners. 3. There…many birds in the tree. 4. The dishes…on the table. 5. My teeth…white. 6. How many students … there in your group? 7. … my shirts washed yet? 8. Not many cities…as big as Moscow. 9. There…many problems in these exercises. 10. There…two libraries in our University.