I have read this story so long ago but I think I could say the Scarlet Ibis and Doodle are very similar and that forshadows up to death. When the scarlet ibis died doodle didn't wan't to live doodle only wanted to be with the scarlet ibis The author forshadows by showing If the bird dies doodle dies.
The difference between the words swarmed and assembled should give you a clue as to what the answer is. Swarmed means to move somewhere in large numbers, usually crowding around something of interest to get a closer look. Assembled means to gather together in one place for a particular reason. This is usually done in an orderly fashion.
explain the reason, and simply beg for the extension like your life depends on it
I think the bolded words would be "whom Mr. Stein chose". The clause whom Mr. Stein chose is an example of an adjective because the clause describes the word student. Student is the subject of the sentence and is a noun. An adjective describes a noun or another subject. an adverb describes a verb or another adverb.