Put the words in brackets into the right forms to complete the sentences

Exercise 6. Put the words in brackets into the right forms to complete the sentences.
1. Many fish in the lake near my house have died because of the ……….water. (pollute)
2. My friend and I are going to give a presentation about our …………..problems. (environment)
3. Too much use of …………. lights in cities may cause light pollution.
(electricity)
4. Nowadays, people use too much herbicide so many animals don't
have enough food and they become ……….. (sickness)
5. Oil spills from ships in oceans and rivers lead to the ……… of many aquatic animals and plants. (die)