Are my suggestions and explanations correct? Someone wrote these two sentences: 1,Opportunities: Four hours Train ride or three days tour with tents. 2,Due to the height of the paths, oxygen is less common. I think he used a bit different words than he wanted to. 1,Opportunities: Four hours Train ride or three days tour with tents. My suggestions: Replace the word 'Opportunities' with 'Options'. (An oppurtunity is a chance whereas an option is a possibility so the latter is available on a long-haul.) 2,Due to the height of the paths, oxygen is less common. My suggestions: Replace the word 'height' with 'altitude'. (The height of something is refers to the distance between the lowest and highest point of an object whereas the altitude is the vertical position of the object compared to the sea level.) Replace the expression 'less common' with 'scarce'. (The expression 'less common' is better for describing occuerence of events or actions while scarce refers to insufficiency of something .)