句型转换。

1. The room is very small. It can't hold so many people. (合并为一个简单句)

    The room isn't ______ ______ to hold so many people.

2. She couldn't find an ad for the Canon digital camera at first. (改为被动语态)

     An ad for the Canon digital camera couldn't ______ ______ at first.

3. Her daughter missed her very much. She rang her up very often. (合并为一个复合句)

    Her daughter missed her ______ much ______ she rang her up very often.

4. We had some pictures taken in the middle of the square. (改为否定句)

    We ______ ______ any pictures taken in the middle of the square.

有下列物质：①氢氧化钠固体　②铜丝　③氯化氢气体　④稀硫酸　⑤二氧化碳气体　⑥熔融氯化钠　⑦碳酸钠粉末　⑧蔗糖晶体．请用序号填空：

（1）上述状态下可导电的是______． （2）属于电解质的是______．

（3）属于非电解质的是______．

（4）上述状态下的电解质不能导电的是______．