даю кучу баллов помогите

1. Mice don't catch cats. Cats catch mice.
2.The Earth doesn't go round the Moon. The Earth goes round the Sun.
3.The river Volga doesn't flow into the Black Sea. The river Volga flows into the Caspian Sea.
4.Patients don't look after nurses in hospitals. Nurses look after patients in hospitals.
5.Water doesn't boil at 50 degrees Centigrade. Water boils at 100 degrees Centigrade.
6.Indians don't live in Scotland. Indians live in America.
7. Carpenters don't make things from metal. Carpenters make things from tree.
8.Our city stands on the Thames.
9.It doesn't often rain in Africa. It rarely rains in Africa.
10.Tigers don't eat grass. Tigers eat meat.
11.Our group studies Chinese.
12.Our classes begin at 8 a.m. every day.