I. Complete the sentences with the correct verb form in the brackets. 1. If we meet 9:3, we( have)_________________________plenty of time. 2.If you(find)______________a pen in the cellar, don't mention it to anyone. 3. The zookeeper would have punshed her with a fine if she(feed)_________ the animal. 4. If you pass your examination, we(have)________________a celebration. 5. Lisa would find the milk if she(look)_______________for it in the fridge. 6. What(happen)______________________if I press this button? 7. The door will be unlocked if you(press)_____________the green button? 8. I should have voted for her if I(have)____________a vote then. 9. If you go to Paris, where you (stay)______________________________? 10. If you(swim)_____________in this lake, you'll shiver from cold. 11. Unless you(tell)_______________the truth, I won't help you. 12. You'll get pneumonia is you(not change)___________your wet clothes. 13. If I had known that you couldn't eat octopus,I( not buy)____________it. 14. If they(hang)________________that picture lower, people would be able to see it. 15. She(be)______________able to walk faster if she didn't have such hight-heel shose. 16. I(bring)__________you some beer if I had known that you were thirsty. 17. If you had toucher that electric cable, you(be)___________electrocuted. 18. If the story hadn't been true, the newpaper( not print)___________it. 19. I(not buy)_____________things on the insallment system if I were you. 20. Dan( arrive)____________________safe if he drove slowly. II. Complete the sentences, using the correct form of the words in brackets. 1. Light pollution makes us____________to see the stars in the sky. (able) 2. Noise is considered as_____________________polution. ( environment) 3. The soil become___________________because of the use of so many pesticides andfertilizers. ( contaminate) 4._________________waste spills can contaminate groundwater. (industry) 5. ________________habitats have been destroyed in recent years. (nature) 6. A number of cleaning products contain______________chemical. (harm) 7. Water samples collected at these villages were seriously______________ with bacteria. ( contaminate) 8. People belive that the____________water has bought cancer to the local residents. ( pollute) 9. In many developing countries, water pollution is usually a leading cause of______________________. (die) 10. _________________elements have been found in both ground and underground water sources. (pollute) 11. Fish ang many other animal are killed by_____________in their habitat. (pollute) 12. Astronomers are concerned about light pollution because they have _____________in viewing activities in the sky and outer space. (difficult)