Написать 3 предложения используя - was writing, was sitting, was having, bad bought, had flown, had started, sold, thought,understood (использовать все слова)

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While I was writing in my journal, my friend was sitting next to me, deep in thought. I had flown to Paris a week earlier and had started feeling homesick. Suddenly, I understood that I had bought a ticket back home and sold my return flight to Paris.