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.