下列词语中加线的字，每对读音都不相同的一组是(　　)

In my bedroom, I have a small desk _____

It is difficult ____the students _____ get to Yunnan.

Mr. Smith is always on time for everything. How________ it be that he was late for the flight

t his wartime experiences, Hemingway____ his famous novel A Farewell to Arms.