Answer:
1.c 2. Dangerous :yes. Polluted yes .Pleasant No 3.C
The gerund in this sentence is "learning". A gerund is a verb form which is acting as a noun, in this case after the preposition "in".
D is correct because it was the beginning of the conversation and also because unlike C, when the guard shouted "or" it wasn't the start of the conversation but a continuation so it didn't need capitalization.<span />
