What are the letters that go on the lines?

A. they give the reader hope. if the whole book was dark & unhopeful it’d be a little less interesting, little moments make it more interesting to read because then you want to know what happens. if it’s all dark there’s no point in reading if you already know the outcome of it.

My answer is b but i dont know if im right

There are many roles that differ for american exchange students. these include assimilating to the culture of the country that one is in, being able to learn the language and communicate with others, as well as being able to understand what is happening in the courses that are taken.