词在填入前需进行词形转换，每个单词只能用一次，每空只能写一词。

    Norman Bethune is one of the most famous ____ for Chinese people. He was not Chinese, but he gave his life to helping Chinese people.

    Norman Bethune was born in 1890, in Canada. He ____ a doctor in 1916. In 1938 he came to China. There were few doctors then, so he had to work very ____. Once, he worked for 69 hours without stopping, and saved 112 people. Although he cut his hand, he did not stop to ____ care of it. In the end, he died from the cut.

    Dr Bethune's work with the Chinese soldiers made ____ a hero in China. He will be remembered by Chinese people for ever.

——Do you think Peter is free today?

——__________. He is really busy preparing(准备) for the coming test these days.

①主要矛盾与次要矛盾在一定条件下相互转化

②矛盾的次要方面和矛盾的主要方面在一定条件下相互转化

③事物的质变必定由量变引起

④量变必然引起质变