Giúp em vs ạ. Cảm ơn trước nha

Past perfect vs past simple 1. They (leave) the shop as soon as they (buy)everything they (need). 2 The house (burn) to the ground buy the time the firemen (arrive). 3. As he (do). 4. I already (hear). about the accident when he (tell. me about it. 5. He (ive). in the country for ten y ...