1years ago, people in London got water from a river. But later the river became very2because many factories were built near the river. People threw many things3the river. By the year 1830, the city was polluted. No fish could live in the water. And nobody could4the water. People tried their best5it. In 1960 the river became clean6, and in 1990, 78 different kinds of fishes were found in it.

—I am        my glasses. I can't see clearly.

— He        Tokyo.