People usually sing because they like music ( 1 ) _ _ because they ( 2 ) f _ _ l 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
`1`. or
`2`. feel
`3`. is
`4`. sing
`5`. are
People usually sing because they like music ( 1 ) or because they ( 2 ) feel happy .They express their happiness by singing . When a bird sings , however , its song usually means much more than that the bird ( 3 )is happy . Birds have many reasons for singing . They ( 4 ) sing to give information . Their songs ( 5 )are their language.
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