Sure! Here are the sentences with the correct tenses filled in:

1. He **spent** a month in Mexico City last year.
2. I **wrote** a letter to him last month, but he **has not relied** on it yet.
3. I **have read** more than 200 pages of this novel already.
4. She **lived** in Manchester City before she got married.
5. Her parents **had** dinner when she came back home.
6. He sometimes **comes** to see his parents.
7. When I came, she **was waiting** for the bus.
8. My grandfather never **flew** in an airplane, and he has no intention of ever doing so.
9. Right now I **am attending** class.
10. I **was attending** class yesterday at this time.
11. She **has lived** on this earth for 55 years.
12. Everyone already **has arrived**.
13. I always **visit** my uncle's home.
14. That book **has been** on the table for weeks. You **have not read** it yet?
15. David **washes** his hair every day.
16. I **spent** my holidays here last year.
17. We never **met** him.
18. The car **is** ready for him several hours.
19. She just **left** a few minutes ago.
20. When we arrived in London, it **was raining**.
21. Last night we **were watching** TV when the power was failing.
22. I **sat** down for a rest while the shoes were repairing.
23. London **has changed** a lot since we first came to live here.
24. While we **were talking**, the children started fighting and broke a window.

Let me know if you need anything else!