介词 at 表时间 — 英语情景题
题目
情景对话：补全对话。
Lily: Hi, Sam! When do you get up?
Sam: I get up (1)________ six thirty.
Lily: When do you have lunch?
Sam: I have lunch (2)________ twelve o'clock.
Lily: When do you go to bed?
Sam: I go to bed (3)________ nine o'clock.