Final answer:
The subject of this question is English in the Middle School grade level and the missing word is 'cutting'.
Step-by-step explanation:
In this question, the subject is English and the grade level is Middle School.
The sentence is asking the reader to get permission before doing something with wood. Based on the context, it seems like the missing word is cutting. So, the complete sentence would be: 'Get permission before you use any special set-ups and before cutting the wood'.
It is important to ask for permission and follow safety guidelines when dealing with tools and materials.