已知：在一定温度下酸浸时Fe3+在pH=2 开始沉淀，pH=3.7 沉淀完全
青春期是人生的“花样年华”，下列做法错误的是（ ）
We go to school from Monday to Friday. We have four classes in the____and three in the afternoon. We have____things to do after class. On Monday and____afternoon we have P.E. On Wednesday morning some of us have a singing class. On____morning some have a drawing class. On Friday____we practice speaking English.
