最佳答案:

　　12345ACBDB678910CCCBD

最佳答案:

　　1112131415BACDA1617181920BCDAD

最佳答案:

　　2122232425DCDBA2627282930CADBB

最佳答案:

　　A

　　31、presented

　　32、concert

　　33、praises

　　34、encouraged

　　35、lasted

　　B

　　36、successfully

　　37、highly

　　38、winners'

　　39、musicians

　　40、lasting

　　C

　　41、has replied

　　42、(had) promised

　　43、will discover

　　44、offers

　　45、is dreaming

最佳答案:

　　46、news

　　47、what

　　48、find

　　49、hospital

　　50、medicine

　　51、later

　　52、lucky

　　53、mouth

　　54、dangerous

　　55、after

最佳答案:

　　Dear Headmaster，

　　We have had a discussion about whether to play music during the break.All the students in our class gave their ideas.

　　Most of us agree that the music should be played.They think listening to music can make them feel happy.Besides，music helps them relax after hard work.What's more ，music can help them improve the study efficiency.

　　On the other hand，some students disagree.They doubt whether they can get expected results by listening to music，as the break is short.In addition，in class some students are still lost in music，which has a bad effect on students.

　　I think what we need is peace instead of the noise produced by the music.So I don't like music.What's your idea？

　　Yours sincerely，

　　John