* Complete the sentences with a/an/the or no article:
1. We spent ........ little time in Paris seeing some of the sights.
2. We are working for ........ cleaner environment.
3. ........ tourists flock to this island every summer.
4. My cousin took ........ part in the London Marathon. .
5. ........ sun sets in ........ west.
6. ......... young don't have much free time to enjoy their childhoods nowadays.