The verb SEEK in Seek professional assistance before using an adapter or extension cord (fourth paragraph) means:
The noun HAZARD in To prevent electrical shock hazard (first paragraph) means:
Choose the verb that completes the sentence correctly, according to the text:
If you __________ the voltage of the electrical outlet you are using, you should contact your local power company.
The verb FIX in do not try to fix it by yourself (sixth paragraph) means: