Use the correct form of the word given in each sentence

III. Use the correct form of the word given in each sentence. (1,5m)
13.  It is __________________ that people have spoiled this area.                 (disappoint)
14. The government is concerned about the _____________ of natural resources.        (conserve)
15. Governments should have stricter laws to limit _____________ which are being discharged into rivers and the sea.                                                                                                                   (pollute)
16. Most of the city streets have been _____________                                                      (pedestrian)
17. Armed __________________broke into the jeweler’s through a hole in the wall.              (rob)
18. There are two new __________________ through the Alps.                                               (tunnel)