根据句意填单词，首字母已给出。（每题2分，共10分）
There’s something wrong with my t ____  .I want to see a dentist.
The p_______ on the bus helped the old man together.
We know the i _________ (重要性)of English study.
Don’t take r______. It’s dangerous.
They made a d_______ to visit Hainan.