A. 请根据句意或括号中的中文提示、英文释义，写出句中所缺单词，使句子通顺。 

小题1:My cousin is studying in Beijing, so we _________(not very often) see each other now.

小题2:—Where’s your mother?

— She is in the ________(厨房) cooking a meal.

小题3:We should try our best to prevent water ________(the state of being dirty) because people can’t live without water.  

小题4:The weather report said that the temperature would fall _________(在……下面) zero.

小题5:We all know that _________is between June and August.

[背景材料]

[问题]

事件2中施工单位的做法是否正确，为什么