Considering you haven't given the actual excerpts, some help would be that direct characterization is as simple as saying "The man is wearing a broad-brimmed hat". It is literally "direct", straight to the point. Hope this helps.
The word <em>over </em>is used as an adverb in this sentence.
If the sentence said - There will be clouds over most of the country, then it would be a preposition.
A perfect class room pet would be a gerbil because it is easy to take care of. It is also very small so it won’t take up a lot of space. Another reason would be that a gerbils cage is very easy to clean out.
They can help by teaching the immigrants English so they can better communicate and they can also house them