Fill in the blanks with the correct form of verbs given in the brackets.1. Someone ____________ (knock) at the door. 2. Good boys ____________ (obey) their elders. 3. Water ____________ (boil) at 100°C. 4. Birds ____________ (fly) in the air. 5. I ____________ (receive) your letter yesterday . 6. My father ____________ (leave) for Mumbai tomorrow. 7. The child ____________ (cry) because it cannot find its mother. 8. My mother ____________ (teach) in a college. She ____________ (go) there in the morning. 9. He ____________ (go) to Shimla tomorrow. 10. Thomas Edison ____________ (invent) the electric lamp in 1879. 11. The clouds ____________ (move) across the sky. 12. Sita ____________ (talk) gently with everyone. 13. It seldom ____________ (rain) here in February. 14. The horse ____________ (gallop) across the fields. 15. When I ____________ (go) to see him, he ____________ (sleep). 16. I ____________ (attend) the meeting tomorrow. 17. Cricket ____________ (originate) in England. 18. I ____________ (try) to solve this sum. 19. He ____________ (study) hard these days. 20. I ____________ (write) a new book. I ____________ (hope) to finish it by the end of this month. 21. It was cloudy in the morning, but the sun ____________ (shine) now. 22. Our country ____________ (make) steady progress under the present government. 23. It ____________ (rain) when I left the house. 24. Don’t disturb me. I ____________ (do) my work.