阅读下列短文,根据以下提示: 1)汉语提示 ;2)首字母提示 3)语境提示,在每个空格内填入一个适当的英语单词,并将该词完整地写在相对应的横线上。所填单词要求意义准确，拼写正确。

Women are playing a much more important part in society today.

Now women are working ___teachers, scientists and even leaders.     小题1:____

We have to admit the fact that almost all jobs ____ used to be done by 小题2:____

men are done perfectly well today by women. Women are no longer l__小题3:____

Down upon in society. With these __(改变) in their social role, women’s小题4:___

position in the family has been __(改善) as well. It is hard to find the 小题5:___

wife is busy while the husband is sitting in an armchair, w__ TV.            小题6:___

In spite of all these changes, a great n___ of men still guard their            小题7:___

rights. They t___ of women as incapable creatures. Sometimes few    小题8:___

women are allowed to ___(出席) important meetings. This is the            小题9:___

problem we should try to __(解决) now                                                   小题10:___

有一瓶澄清溶液，可能含有H⁺、NH₄⁺、K⁺、Mg²⁺、Ba²⁺、 Al³⁺、Fe³⁺、SO₄^2-、CO₃^2-、NO₃^-、 Cl^-、I^-，先进行如下试验：

①测知溶液显强酸性；

②取样加少量四氯化碳和数滴新制氯水，四氯化碳层为紫红色；

③另取样品滴加稀NaOH溶液，使溶液变为碱性，此过程无沉淀生成；

④取少量上述碱性溶液，加Na₂CO₃溶液出现白色沉淀；

⑤将③中的碱性溶液加热，有气体放出，该气体能使湿润的红色石蕊试纸变蓝。

原溶液中肯定存在的离子是_____________；肯定不存在的离子是_____________；不能确定是否存在的离子是_____________。