5 RND the text with the words derived from the words in bold in their correct forms. Last week's oil spill has caused a very serious 1) _______ crisis in our area. A team of 2) _______ are now working around the clock to ensure that a thorough clean-up job is done. Everyone is working 3) _______ hard but scientists say it will take many more weeks to reduce the 4) _______ levels. The most important thing is that _______ to ensure that as many animals as possible are saved and cared for. Up to now, only a few animals and birds have died, so we can say that our rescue efforts so far have been 6) _______ .