1. my friend's father is a well-known_________ in robotics. (SCIENCE)
2. I like attending_______ events in order to watch professional players perform. (SPORT)
3. Jack loves________at the children's hospital. (VOLUNTARY)
4. I think Mary performed better than Jane in the______tonight. (TRAGIC)
5. Surgeons need to be_____so that they can cure illnesses and save people. (CARE)
6. Those pollutants have_______the lives of many seabirds in the past few years. (DANGER)