One day, Peters was bored. He was in his......... and his mother was.................in the kitchen. She asked loudly "Where are you, Peter?" He................., "I'm upstairs, Mum." His mother heard him running down and said: " Don't.............. down the stairs!" Peter replied, "OK, I ................do it again, Mum." điền vào chỗ trống các từ sau sao cho thích hợp: cooking room answered won't run