根据所给句子的意思，填上合适的单词，并注意其正确形式, 首字母已给出。
Wang Wei is very stubborn, so it is not easy for her to change her m___________.
If you have some trouble, you can go to the teacher for a_________.
Though he is a n________ English speaker, he can’t speak English very fluently.
I don’t think it was an accident at all. Your brother did it on p____________.
I was very excited. It took me some time to c______ down myself.