Сделайте, пожалуйста, в Conditional 3 эти предложения ( Те, что стоят через / , нужно объединить в одно предложение).
1) Рeople invented different machines. / Рeople built a lot of plants and factories.
2) People built a lot of plants and factories. / Plants and factories polluted the evironment.
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1) If people had not invented different machines, they wouldn't have built a lot of plants and factories.2) If people had not built a lot of plants and factories, they wouldn't have polluted the evironment.