Определитель время и вставте правильный глагол. they (go) to london i (do) already my homework he (play) football from 5 till 7 yesterday.

Went have already done was playing

What do you know about the  environmental pollution? - people have always polluted their surroundings. but until now pollution was not such a serious problem.-you don't say so! what do you mean? - in past most people lived in uncrowded rural areas and didn’t have pollution-causing machines. but with the development of crowded industrial cities the problem of pollution has become more important.-and what causes the pollution to your mind? - using automobiles and other machines made pollution steadily worse.  -oh, i absolutely agree. but can the pollution cause any health problems? what do you think? -sure! p olluted air can cause illness, and even death. polluted water kills fish and other marine life. on polluted soil, food products can’t be grown.-oh, i have never thought that it can be that bad! -yes, and moreover  environmental pollution spoils the natural beauty of our planet.-i see, but what can people do to reduce the pollution? -well, it's not a secret, but  people would have to stop using many useful things if they wanted to end pollution immediately. most people don’t agree to do that.-well, this is clear, but can we do anything now to help our planet? - scientists and engineers can find the ways to reduce pollution from automobiles and factories. government can pass the laws that would make enterprises take measures for reducing of pollution. individuals and groups of people can work together to persuade enterprises to stop polluting environment.-oh, thank you very much! your advice is of great help!