challenge discover depend investigate contribute cover conserve entrap maintain mystery 1. Scientists have made many important new……………..of the depth by using modern devices. 2. Community police have made a very positive……………..to crime prevention. 3. This new discovery……………..traditional beliefs. 4. They are investigating the……………..disappearance of a young woman. 5. Seventy-five percent of the earth surface is……………..by water. 6. The power station has been shut down for essential…………….. 7. The……………..of the seabed is being carried out. 8. Sperm whale populations are at risk due to hunting and their accidental……………. in fishing nets. 9. By the age of eighteen he was complete……………..of his parents. 10. The government has just set up a wildlife……………..project. điền mấy từ này vào chỗ ....