The old photos made me think 　　the good old days

One day， you will leave your parents． You have to learn to look after　　．

在空白处填入一个适当的词，使句子意思完整、语法正确．

You're supposed to　　at the door and wait before entering the office．

I've heard many beautiful clothes are on　　in the clothes store． let's go shopping now．

You'd better not stay out　　with your friends． You need to come back by 9p．m．