10.2

Unit 10. Exercise 17.

A. Complete the dialogue with the given sentences.

Then listen and check.

Hi, Dad. What are you doing?

Join me, dear. I am planting trees.

Why do you plant them?

Because trees are our life sources.

They produce oxygen, so they prevent air pollution.

They feed the soil and prevent landslides.

Animals can find places to live, and they help wildlife conservation.

They bring rainfalls, help ecosystems, and prevent global warming.

Finally, they are green and help us feel happy, so I think everybody should plant trees.

Wow! I didn't know that trees are so important.

You're right. Everybody should plant a tree. They shouldn't damage forests.

Every year, thousands of trees burn because of forest fires.

Devoristration will be a big problem.

A lot of animals also die in forest fires. We need to protect wildlife.

Oh, no! The world is getting worse, Dad.

What do you think will be the most threatening problem in the future?

There are lots of problems, dear, but I think biological pollutants will be the worst.

What is that, Dad? What do you mean?

The things like bacteria, viruses, molds, pollen, and infections.

Scientists are trying to find solutions for many diseases,

but toxic waste make people unhealthy day by day.

There are lots of people with cancer around us,

and most of them are caused by the chemicals we use.

Oh, my God! It is very dangerous. Can people prevent it?

I am not sure, but they can't start using non -toxic materials for cleaning,

and they can use recyclable products.

You're right, Dad. I think I should talk about it in the classroom tomorrow.

They can use recyclable products.