题目内容：

1.Welcome back ___school ,boys amd girls.A.at B/ c.in D.to 选择
2.I___him caefully,but I ___nothing
A.listees ,heard B.hear,listen C.lisrenes to ,heard
3.There are some___on the desk
A.pieces of paper Bpieces of papers C.piece of papers D.papers答案加解释,

优质解答

1,D welcome back to sp.是固定搭配
2,D是listened to吧,是的话就对了.listen和hear的区别就在于listen是有意去听的,而hear是结果
3,A paper除了作“报纸”“文件、资料”“考卷”“论文”时可数外,其它纸都不可数,所以s要加在量词piece后