Вставте предлоги 1) there is no need to switch the upper light, it isn’t dark in the room. 2) the scientists should think about the way to prevent rare animals becoming extinct. 3) water pollution is caused human activities. 4) air pollution has negative impact climate changes. 5) huge areas of rainforests have been cut for urban development. 6) the amount waste and rubbish in big cities is increasing.