One summer evening during a violent thunderstorm a mother was tucking her small boy into bed.She was about to turn off the light when he asked with a tremor in his voice，“Mommy，will you sleep with me tonight ?”The mother smiled and gave him a reassuring3) hug. “I can' t，dear.” She said.“I have to sleep in Daddy's room.”Along silence was broken at last by his shaky little voice：“The big sissy.”

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