Sure! Here are the correct forms of the verbs:

12. I **am staying** with my parents at the moment, though I **have** my own flat.
13. Listen! Someone **is knocking** at the door.
14. I hope it **does not rain**.
15. What time **does** the bus **leave** for Dave tomorrow? - It **leaves** at 7.45.
16. My father **is always worrying** about us.
17. Everything on the Earth **is always changing**.
18. We **are having** a small party next Sunday. Would you like to **come**?
19. Look at that car. It **is driving** too fast. It **is going to hit** that cyclist.
20. I bought a fishing rod. I **am going** fishing this afternoon.
21. My mother **always forgets** her umbrella at the supermarket.
22. What **are** you **doing** tonight? - I don't know. I will probably **stay** home and watch TV.
23. I hope I **become** a singer one day.
24. They **will visit** me when they **come back**.
25. He **is taking part** in an important meeting next Saturday.
26. A new supermarket **is opening** in this town in the future.
27. If he **does not phone** us, we won't tell him the news.
28. He **will stay** at home if it **rains** tomorrow.
29. It's very cold here. You **can close** the window for me, please?
30. A: We've run out of sugar. B: Alright. I **will go** and buy some.
31. The flight to HCM City **leaves** Hanoi at 10 and **arrives** there at 11.
32. She sometimes **watches** movies on Sunday.
33. Look! Our teacher **is coming**. She **has** long hair.
34. The children **like** to play in the park.
35. Something **smells** good in the kitchen now.
36. Thanh prefers **to listen** to music **rather than** (watch) TV.
37. Tomorrow **is** Sunday, so I **am not going** to school.