In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.
Throughout the ages, birds have been a source of wonder to all who have (1)______ their soaring flight or listened to (2)______ sweet songs. As a group, birds are (3)______. They are the only creatures covered (4)______ feathers. This evolutionary development (5)______ birds from all other animals.
Select the most appropriate option to fill in blank No.2.
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