Ex.2. Fill in the blanks with the required forms of the verb to be in the Present Tense:
1. I ... twenty.
2. You ... thirty.
3. They ... doctors.
4. She ... a swimmer.
5. He ... a very good friend.
6. We ... very busy in summer.
7. One of my friends ... fond of reading.
8. Football ... the most popular kind of sport.
9. My father … proud of my marks.
10. My friends … good at different sport games.