Listen to the interview and complete the sentences

1. The pink river dolphin has a(n)
   [ ] on its back.
2. It was difficult to take photographs because the water was
   [ ].
3. The dolphins relaxed after the crew gave them some
   [ ].
4. The pink river dolphin has now become a(n)
   [ ][ ].
5. Pink dolphins are being poisoned by
   [ ] from gold mines.
6. Dolphins can't reach food due to the building of many
   [ ].