Put your books _ .You must look _ your things.
问题描述：
Put your books _ .You must look _ your things.
The children are _ school and the parents are _ work（用适当的介词或副词填空）
答
Put your books （back） .You must look （after） your things.
把你的书放回原处.你必须看好你自己的东西.
The children are （in）school and the parents are （at） work
孩子们正在上学而父母们正在工作.
at work 上班,工作
in school 在上学