一、根据句意和所给的中文提示，写出句子中的单词
1．Drivers must know and follow the ______ (安全) rules.
2．We saw a little girl ______ (哭) on our way to school.
3．I gave John a ______ (拥抱) as soon as I met him at the railway station.
4．It's difficult for young people to deal with all kinds of problems in modern ______ (社会)．
5．My mother is sleeping. Don't make too much ______ (噪音).
