Sure, I'll help you with the correct forms of the words to complete the sentences:

1. He claims he is not really interested in (famous) **fame**.
2. It’s (ease) **easily** recognised by its bright blue tail feathers.
3. (Tradition) **Traditionally**, everything is carried in baskets on the head or shoulders.
4. For (tradition) **tradition**, Marks has included all the familiar recipes as well.
5. Monday’s a bit (convenience) **inconvenient** for me. How about Wednesday?
6. They need more funds to (modern) **modernize** the country’s telephone system.
7. Their (special) **specialty** is prime rib.
8. Christian Lacroix was one of Paris's most flamboyant dress **designers**.
9. Old people often try to (economy) **economize** on heating, thus endangering their health.
10. They discussed social, (economy) **economic** and political issues.
11. A small car is more (economy) **economical** to run.
12. The crew acted (courage) **courageously** in staying with the ship until all the passengers had been taken to safety.
13. This month's unemployment figures are not very (courage) **encouraging**.
14. She was given every (courage) **encouragement** to try something new.
15. This is a campaign to (courage) **discourage** smoking among teenagers.
16. It's (fashion) **unfashionable** these days to say you want to get married and give up your job, isn't it?
17. Many religious (minor) **minorities** fear their beliefs will be ignored.
18. There is a (poet) **poetic** quality to her playing.
19. Everyone in the family was (argument) **argumentative**.
20. He quickly becomes (argument) **argumentative** after a few drinks.
21. The campaign is on the way to becoming (nation) **national**.
22. The chemical was almost totally (effect) **ineffective** in killing the weeds.
23. They (special) **specialize** in the big picture and are no good at details.
24. We should respect animals and the (nature) **natural** environment, which is their home.
25. A group of local (music) **musicians** entertained the guests.

I hope this helps!