①The school ____（旅行）is from November 12 to 13. The students will have fun.

②-Do you have an Art F____（节日）?

   -No, we don't.

③They have a birthday p____（聚会）for her son.

④His brother is the first in the English ____（测试）．

⑤I'm very ____（忙碌）now, so I can't go with you.

⑥There are twelve ____（月）in a year.

三个连续奇数的和是45，其中最大的奇数是多少？

①测得A溶液呈碱性，E溶液的pH为1，C溶液的酸性强于E溶液．

②向B溶液中滴入D溶液，出现白色沉淀和无色无味气体，该白色沉淀既能溶于A溶液，又能溶于C溶液；过滤，向滤液中加入A溶液，加热，有刺激性气味气体产生．

③向B溶液中滴加F溶液，产生白色沉淀，加入过量E溶液，沉淀不溶解．

④向E溶液中滴加F溶液，无明显变化．

根据上述实验现象，回答下列问题：