Either of the first two sentences are possible. The last two are not (there is no word "lastest"). But I would not write any of these, because they are awkwardly said.
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seagull (a) This morning John came into the classroom last of us all. (b) This morning John came into the classroom the last of all. (c) This morning John came into the classroom latest of us all. (d) This morning John came into the classroom the latest of us all. Which is the most appropriate of the above four items? Besides, what do you gtmake of the other three sentenc