1. A predicative nominative is a noun or a pronoun which follows a linking verb and refers to something before that verb. In your case, the correct answer is B, because "a shelter" goes after the linking verb "is", and refers to "a lean-to".
2. A participle has the form of infinitive + ing. In this case, the answer is D, flourishing.
The answer is B an adjective
1. Nobody wants to pay for a newspaper anymore when they have everything on their phones/internet for free. Sites such as aol offer free news at the click of a button so why would anyone want to pay for a newspaper or a newspaper subscription
2. With advancements in technology, such as the ability of newscasters to live stream things, information has become available much faster and it is much easier to get all your news listening to it on the TV with stimulating images as oppose to having to flip through pages and pages of a paper trying to find a good story.
He's a human. he can behave how he feels