What are 3 factors of communication/

Based on its structure, which word  most likely  means "someone who takes advantage of circumstances”?

You are reading an informational text for english class, and you find a lot of words you don't know. your teacher says you don't need to look up all of them in the dictionary, only the ones you need to get the main point of the text. how could text features you figure out which words to look up?

What is the historical context of the diary of a young girl by anne frank? o the holocaust o world war i siege on sarajevo the american civil war