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----- Nội dung dịch tự động từ ảnh -----
People usually sing because they like music (1) -- because they (2) f__1 happy. They
express their happiness by singing. When a bird sings, however, its song usually means
much more than that the bird (3) -- happy. Birds have many reasons for singing. They (4)
s_-- to give information. Their songs (5) --- their language.