Hoàn thành câu với dạng đúng của các động từ sau:
challenge cover depend investigate maintain
discover conserve mystery entrap contribute
1. The government has just set up a wildlife.....................project.
2. Community police have made a very positive...................to crime prevention.
3. Sperm whale populations are at risk due to hunting and their accidental..................in fishing nets.
4. Destruction of the environment is one of the most serious...................we face.
5. They are investigating the......................disappearance of a young woman.
6. Seventy-five percent of the earth surface is....................by water.
7. The power station has been shut dơn for essential.....................
8. The.....................of the seabed is being carried out.
9. Scientists have made many important new...............of the depth by using modern devices.
10. By the age of eighteen he was completely...................of his parents.
1. conservation
2. contribution
3. entrapment
4. challenges
5. mysterious
6. covered
7. maintenance
8. investigation
9. discoveries
10. independent