根据句子意思及所给单词首字母（或汉语提示），完成下列单词。
It’s p_______ to say “Thank you .” when someone helps you.
Hainan i______is the second biggest in China .
The movie was boring. I fell a______ half way through it.
Summer ________（假期）is coming ,I’m going to visit Beijing.
_________(吸烟) is bad for your health.