阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。

Do you know the man in the picture? His name is Zhong Nanshan. He is a great doctor from China and he1many people's lives.

We all know that SARS and COVID-19 are2diseases(疾病). Many people got sick(生病的) because of them 3 some lost their lives.

Quite a lot of people were4of SARS and COVID-19. But Zhong was brave (勇敢的) to fight 5 Zhong often went to see the sick people in hospital. He also 6days and nights studying SARS and cOVID-19. At last, he7some good ways to fight the diseases. In these8, many sick people got well.

People thank Zhong very much for his help. But he9says. "I am just a doctor."

10a great doctor!