IV. Put a suitable preposition in each blank: 13. We’ve come up ……….. an idea about our environmental project! 14. The poisonous chemical waste is dumped ……….. lakes and rivers. 15. Different kinds of entertainment are provided ……….. the park. 16. In many cultures, it’s considered rude if you push ……….. people who are trying to get out of a bus or a train. V. Write the correct form of the words in brackets: 17. Some people need medical help because they have drunk ………………………… water. (contamination) 18. A ………………………… is a person who takes part in the protection of the environment. (conserve) 19. Alaska has an ………………………… high number of lakes. (incredible) 20. Scotland is famous for its rich culture as well as its ………………………… natural beauty. (amazement)