根据场景完成对话。
A:What do you think of the question whether students can use cellphones?
B: ①_______________students shouldn't use cellphones.
C: ② ___________ （恐怕我不能同意你的意见）.I think the cellphone is helpful to us.
B: ③ ___________ （我不这样认为）．
A:Can you give us some reasons?
B: ④ ___________ （好的）．It does harm to our study. Besides,it will waste our time and money.
