The text asks to fill in the blanks in the passage about dolphins with the correct grammatical forms of words. Choose the correct option for each blank.

Solution:

• A: intelligent (The sentence requires an adjective to describe "creatures")
• B: to (The phrase "come to" is idiomatic for dolphins appearing.)
• C: can (The sentence structure requires a modal verb indicating ability.)
• D: species (The sentence refers to the number of different types of dolphins.)
• E: which (The clause "which can identify" introduces a relative clause describing the sounds.)

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