Nhanh với ạ ----- 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.
