5.Thesweetest_____intheworldisbirds'singing,Ithink.(C)
A.noiseB.soundC.voice
6.It'snothingserious.You'vejustcaught______cold.(B)
A.alittleB.abitof
7.Hecasthisnet____thirdtime,anddrewinalotofstones.(A)
A.aB.the
希望能够多答案进行分析,最好把别的选项不正确的理由写一下.