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