How lovely!They are many birds.They are( )happily..

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Howlovely!Theyaremanybirds.Theyare()happily..Howlovely!Theyaremanybirds.Theyare()happily..Howlovely!

How lovely!They are many birds.They are( )happily..
How lovely!They are many birds.They are( )happily..

How lovely!They are many birds.They are( )happily..
How lovely!They are many birds.They aresohappily

flying 或者singing