\"To be\" в нужно форме нужно вставить так:1. He was born in 1998. 2. We are students now. 3. We are good friends. 4. It is an interesting book. 5. Who is absent today? 6. He is a student. 7. What is she? – She is a doctor. 8. These are my pencils. 9. Where is this book? – It is on the table. 10. What are their names? 11. How is she? 12. How are you? – I am fine. 13. Is he your friend? 14. Tomorrow we are at home. 15. My teeth are white. 16. Not many cities are as big as Moscow. 17. Yu. Gagarin was the first cosmonaut. 18. Gogol I. and Tolstoy L. are famous Russian writers.