单项选择题
When the lights turn red, the traffic（）stop.
A.canB.mayC.mustD.needn't
单项选择题 When Lily came home at 5 p.m. yesterday, her mother（）dinner in the kitchen.
单项选择题 When I was a child, I enjoyed（）picturebooks.
单项选择题 When I got home, my little brother was（）
