1. The water is _____. You can't drink it. A. polluted B. pollution C. polluting D. pollutant 2. I am very _______ in the news. A. interested B. interesting C. interest D. interests 3. Many spacemen could never get back to the Earth because of ____ accidents. A. tragedy B. tragic C. tragically D. tragedies 4. They have no _____ for help. A. expectation B. expect C. expectative D. expectancy 5. Boys and girls may behave _____ in this situation. A. difference B. differing C. different D. differently 6. All of us were _____ that he was successful in the final exam. A. surprising B. surprisingly C. surprise D. surprised 7. One recent ________ in medicine is the development of laser in treating cancer. A. achievements B. achievement C. achiever D. achieved 8. You have to be aware of the damage humans are doing to quicken the ________ of wildlife. A. extinct B. extinctive C. extinctions D. extinction 9. He was finally _________ in his final attempt. A. successful B. successive C. unsuccessful D. success 10. They did everything possible to _______ the police force. A. strengthen B. strengthening C. strength D. stronger