Here are the correct word forms for the words in brackets:

1. Celebrating customs and traditions can help to promote cultural ties and promote unity. **(strong)** → **strength**
2. Many cultural organisations work to preserve cultural customs and practices. **(tradition)** → **traditional**
3. The **preservation** of cultural heritage is important to maintain a sense of identity and history. **(preserve)** → **preservation**
4. Traditional dance and music **performance** is an integral part of many cultural celebrations. **(perform)** → **performance**
5. Participating in cultural **activities** can be a fun and educational way to learn about different customs and traditions. **(active)** → **activity**
6. The Lunar New Year **celebration** is a colourful and festive occasion in many cultures. **(celebrate)** → **celebration**
7. Friendly **competition** is often a part of cultural festivals and events, bringing people together in a spirit of good sportsmanship. **(compete)** → **competition**
8. Increasing **awareness** and understanding of other cultures' customs and traditions can promote respect and tolerance. **(aware)** → **awareness**
9. Many traditional customs involve the use of **decorative** items such as colourful clothing, elaborate headdresses, or intricate patterns. **(decorate)** → **decorative**
10. The **admired** thing about cultural celebrations is that they bring people together in a spirit of unity and joy. **(admire)** → **admired**