1. Correct, but I can't think of a time I've ever said "least cheap" when I could have said "most expensive." 2. "This occurrence isn't so much an accident as it is a necessity." You can use the noun "occurrence" to describe something that happened. "Happening" is a word (like the movie "the Happening"), but I would use occurance in this context. 3. correct

1. Correct/makes sense, but would sound better as "Our massage shop is not the cheapest shop in this area" (Last part is just for reference). 2. This happening is not so much an accident as it is a necessity. 3. correct Let me know if this helps