EXERCISE 2: Complete the sentences using the correct forms of the words in exercise 1.

1. Language is considered the most important feature of a nation's ______.

2. Most New Year's ______ begin on 31 December.

3. The ______ of that custom is still a mystery to local people.

4. This article discusses current ______ in fashion styles among young people.

5. The ______ of cycling among young people has increased.