Choose the sentence that best combines each pair of sentences given.

Plastic takes hundreds of years to decompose in the ground. That is harmful to the environment.

Every action, however small it is, contributes to protecting the environment.

Only big actions can help protect the environment.

Small actions are not useful for the environment.

It is impossible to protect the environment with small actions.

Peter promised to buy Mary a beautiful dress.

Peter said thanks to Mary for her beautiful dress.

Peter asked Mary how she had just bought her beautiful dress.

Peter complimented Mary on her beautiful dress.

People must never take their helmet off while they are riding a motorbike.

Those who are wearing a helmet are not allowed to ride a motorbike.

It is the helmet that one needn't wear when he is riding a motorbike.

You should not wear a helmet when you are riding a motorbike.

Forest cutting helps animals find new homes.

Forest destruction causes many animals to lose their habitats.

Cutting down forests saves many animals.

Animals will build new homes if forests are destroyed.

Recycling saves resources, but it causes more pollution.

Recycling not only saves resources but also helps reduce pollution.

Recycling causes both resource loss and pollution.

Recycling has nothing to do with pollution or resources.

Reusable bottles are better for the environment than single-use plastic ones.

We should never use reusable bottles but single-use plastic ones.

Single-use plastic bottles are more environmentally friendly than reusable bottles.

Using single-use bottles is the only way to save the environment.

Leaving the lights on is a way to save energy.

We can save energy by turning off the lights when unnecessary.

Saving energy means never using lights.

The best way to waste energy is to turn off the lights.