Fill in the gaps with the right words.

1. The scientist who invented this device had great ... .
2. It took three attempts but in the end, the scientist was able to ... his theory.
3. The sound of a humpback whale singing is ... .
4. The world needs to pay attention to the ... of humpback whales and help them survive.
5. Whales are ... creatures.
6. The international whaling commission introduced a ... on whale hunting.
7. Several issues were ... during the meeting.