答案：1、What did your brother hear five minutes ago?2、How do the children sleep?3、He found nothing in the bushes.4、Did Simon brush his shoes yesterday?5、They are not students any longer.=They are...(be)your mother at work last night
Nobody(be)in the park at that time.
Mrs.Green is in the classroom .She (talk)with some students.
翻译；撞上某人答案如下：
(Was) your mother at work last night？
Nobody (was) in the park at that time.
Mrs.Green is in the classroom .She (is talking)with some students.
翻译；撞上某人——knock into sb

请采纳！