根据汉语提示完成下列句子,每空一词。 1. 昨天火车准时到达这儿了吗? Did the train arrive here _____ yesterday? 2. 一个贼破门而入,偷走了他们的电脑。 A thief _____ _____ their house and stole their computer. 3. 老师已经开始讲课了,对吗? The teacher has _____ _____ , hasn't she? 4. 八点了,请马上叫醒他。 It's eight o'clock _____ him _____ at once, please. 5. 今天会上有多少人出席了? How many people _____ at the meeting today?