The toilet is running because either water is running in the toilet or water is running out. You need to replace the fill valve and/or the flapper.
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Q: My home is about 20 years old. My problem is with the lights in the kitchen. Sometimes they work and sometimes they don’t. When I turn on the switch, the light flickers or just partially lights. I have replaced the fluorescent tubes, but they still don’t work properly. What should I do?