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If the hole is not big, you'd better use glass glue, and if it's a little big, you'd better use cement mixed with yellow sand to plug it.
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Foam glue is not easy to be opened.
Upstairs said well, it is best to find a mechanical cutting of concrete, the time is fast, and the damage to the floor slab is small. But I'm wondering how to open such a big hole, and there are no other reinforcement measures for the floor slab?
Caused by oxidation of the line. Check the two places of the bathroom light connector and the bathroom socket connector, because your home lighting socket shares a power supply, so just check these two places, don't forget to turn off the power, if you don't, find an electrician.
It should have climbed up from the sewer pipe, and it is recommended to spray it with insecticide.
An extra bathroom would be good.
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In the three bedrooms, the lights in the kitchen and bathroom are not on, and the lights in the living room are on, which should be the bulb is broken.