Mark Twain ____ Tom Sawyer. Doug was cold because he ____ in the snow all morning. By the time I ____, Sue had already finished her homework. How long ____ for Frank last night? Pat was studying while Andy ____ his bike. Professor Adams____ birds all her life. The burglars managed to break into the house because the alarm ____. The police ____ the thief but didn't manage to arrest him. The lights ____ so the play had to stop. Once he finished talking about deforestation, he ____ to talk about energy waste.




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