12 Read the following sentences. How are the clauses of purpose introduced? Now join the sentences using to or so that.

12. Join the sentences using to or so that: 1. We should stop cutting down trees **to** help animals keep their natural habitats / **so that** animals won't lose their natural habitats. 2. We should build wildlife parks **to** protect animals from extinction / **so that** we can protect animals from extinction. 3. We should plant more trees **to** have more oxygen / **so that** we will have more oxygen. 4. We should clean up the litter in cities **to** avoid catching diseases / **so that** we won't catch diseases from it. 5. We should find clean forms of energy **to** save the planet / **so that** we can save the planet. 13. Match the suggestions with their results and link them: - 1 + d: Governments should improve public transport **so that** people won't have to use cars to get around. - 2 + a: People should get involved in recycling schemes **to** have less rubbish to pollute the environment. - 3 + c: We should ban cars from city centres **so that** we can make the streets cleaner, safer and quieter. - 4 + e: Governments should force factories to put filters on chimneys **so that** harmful gases won't be able to pollute the atmosphere. - 5 + b: We should stop using the products of companies whose factories cause pollution **to** force them to use environmentally friendly production methods.