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Many wildlife habitats will be destroyed if man _____________________ (keep) polluting the environment.
Many wildlife habitats will be destroyed if man KEEPS polluting the environment.
If we dump all sorts of chemicals into rivers, we _______________ (not be able to) swim in them in the future.
If we dump all sorts of chemicals into rivers, we WON’T BE ABLE TO swim in them in the future.
If we __________________ (not stop) cutting down so many trees, we ___________________ (endanger) our oxygen supply.
If we DON’T STOP cutting down so many trees, we WILL ENDANGER our oxygen supply.
Soon the Earth’s resources will be exhausted if the human population ____________________ (continue) to grow.
Soon the Earth’s resources will be exhausted if the human population CONTINUES to grow.
If everybody continues to use aerosols and CFCs, the hole in the ozone layer ______________________ (get) bigger.
If everybody continues to use aerosols and CFCs, the hole in the ozone layer WILL GET bigger.
If the sun radiation can’t escape into space, Earth’s temperature _____________________ (increase) steadily.
If the sun radiation can’t escape into space, Earth’s temperature WILL INCREASE steadily.
