Put the verbs in brackets into the correct passive form. 1)

Put the verbs in brackets into the correct passive form. 1) Global warming ___is believed__ (to believe) to be caused by the greenhouse effect.
2) The seas_________(to fill) with poison: industrial and nuclear waste, chemical fertilisers and pesticides.
3) If nothing __________(do) about it, one day no animal or plant will be able to live in the seas.
4) Tons of harmful substances___________(to emit daily) by industrial enterprises.
5) As globalization continues and the earths natural processes transform local problems into international issues, few societies__________(to leave) untouched by major environmental problems.
6) Acid rain, one of the most important environmental problems of all, cannot________(to see). The invisible gases that cause acid rain usually come from automobiles or coal-burning power plants.
7) Air pollution can have serious consequences for the health of human beings; the natural ecosystem_________(to affect) severely by it.

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