I don't know much about the Sydney mines, but from the context, I can infer that the tunnels were unsafe. Whether being that they were collapsing, or they were filled with poisonous gasses.
Brother quang?? is he your brother? what book is this from? Sorry i do not kbnow thte answer include more details
Things like heroin and do not get off topic with different types of drugs express 3-4 drugs and their effects explaining why youths shouldn't use them.
Answer:
4
Explanation:
This is the correct answer because it correctly employs the comma to separate the prepositional phrase at the beginning of the sentences with the remaining part of the sentence.
The comma is necessary because without it the word time could potentially belong to the phrase if we were teenagers or to these licenses. The comma creates a needed pause in the sentence that allows the reader to oriente him/herself and keep the elements in context.
