单词拼写(每小题1分,共5分)
It is a p______ that the weather is so bad today. We can’t go to a picnic.
You should always knock at the door before you e______ a room.
It is p_______(礼貌的)to offer seats to the old on the bus.
When swimming, you should put s_______(安全)first.
The newly-opened museum is certainly w_______(值得)a visit.