Fill the gaps with a word from the vocabulary section.

1. Cars make air pollution worse in towns.
2. Their wages were very low so the workers went on .
3. My great-grandfather died in the First World .
4. Jack had a last year but fortunately no one was hurt.
5. Japan often has and Siberia often has .
6. When people are they sometimes sleep on the streets.
7. I hate driving in the city in the .
8. The water is so that people cannot drink it.