11.6.7 11.6.9 complete the summary of the text by putting the words in bold in the correct tense form. generally, dolphins 1) (find) in pods for protection, support and social interaction. for many years, marine biologists 2) (study) how dolphins communicate and navigate through the ocean. undoubtedly, they are intelligent creatures. in the past. they 3) (also/think) to be cute and friendly, but it 4) (discover) that some exhibit aggressive behaviour. in the 1990s, the tide 5) (wash up) nine young dolphins on the shores of virginia, usa. after research, scientists concluded they 6) (kill) by larger dolphins. this discovery 7) (already/change) our ideas about dolphins and currently some people 8) (wonder) if swimming with them is really safe for humans.​

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