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

My father has learned about planting trees in the garden. This contributes to a healthier 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.

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.

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.

If renewable energy were used more widely, pollution would go down.

Pollution decreases although renewable energy is used.

Renewable energy increases pollution if used widely.

Pollution would rise if renewable energy were used more.

People began to change their habits only when plastic waste turned into a global issue.

People changed their habits long before plastic waste became a problem.

Plastic waste has never been a global issue, so habits remain unchanged.

People have always had habits of reducing plastic waste.