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A rat cut/ate our mouse wire/cable. Now I will need to buy a new one.
Our roof is so low that if I stand straight the ceiling fan hits my head. Once incidentally I raised up my hand and the fan cut/hurt my finger badly.

Please correct my sentence and suggest me better versions too.
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Not quite, Aaron.

A rat chewed through our mouse cord. Now I need to buy a new one.

Our roof is so low that if I stand straight the ceiling fan hits my head. Once I accidentally raised my hand, and the fan cut my finger badly.
Comments  
A rat chewed through our mouse cord.
The fan cut my finger badly.

There you go!
~Aaron
 Mister Micawber's reply was promoted to an answer.