Điền hộ em với ạ
 
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happy
express
19:43
singing
looking for
home
beautiful
SUBMIT
People usually sing because they like music or because they feel happy. They (1)__ their
happiness by singing. When a bird sing, however, its song usually means much more than
that the bird is happy. Birds have many reasons for (2)_-- . They sing to give
information. Their songs are their language. The most (3)_-- songs are sung by male (cock)
birds. They sing when they want to attract a female (hen) bird. It is their way of saying
that they are (4)_-- a wife. Birds also sing to tell other birds to keep away. To a bird,
his tree or even a branch of tree, is his (5)--- · He does not want strangers to come near
him, so he sings to warn them.