A BBC film crew was working on the remote Lord Howe Island for a new wildlife documentary called Drowning in Plastic. They filmed many birds that 【小题1】 (die) for no clear reason. After some research, they found out the truth—【小题2】 caused the death of the birds was that their stomachs were literally too full of plastic. The documentary team also filmed biologists 【小题3】 (work) on the island to save the birds. The scientists captured hundreds of chicks and removed plastic from their stomachs to give them a chance of 【小题4】 (survive).