Sally helped her mum about the house. —
нужно подобрать отрицательную форму

1.a garbage is not only ugly, bute dangerous because it causes an air pollution.

2. cars are an important part of a life for most people. but cars also cause a pollution and release fume.

3. in canada people don't realise that they throw out 10,000 tons of a waste.

4. over 14 billion pounds of a waste per year is throw out to sea and it kills millions of sea animals.

5. if we want to breathe  a healthy air we have to think about what we do.

6. because of our lack of a knowledge there is now a huge hole over an antractic.

7.a water is a vital element of a life.

hi, mary! how are you doing? hello anne, everything is fine, getting ready for birthday.oh! you have a birthday soon? yes, on february 12, ie after 2 days.already made the guest list? yes, and i want you to also come to me.thank you for the invitation. be sure to come.i am very glad, i want on my birthday was a lot of people because it is the favorite holiday!