E12- U3 - LOOKING BACK - GRAMMAR

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We read food labels carefully. We want to buy only organic products.

We read food labels carefully, for we want to buy only organic products.

The burning of fossil fuels is the largest source of greenhouse gas emissions. The burning of fossil fuels causes air pollution.

The burning of fossil fuels is the largest source of greenhouse gas emissions and causes air pollution.

Shall we organise a tree-planting day? Shall we launch a recycling campaign at school?

Shall we organise a tree-planting day or launch a recycling campaign at school?

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