阅读下面短文，从短文后各题所给的四个选项（A、B、C、D）中，选出可以填入空白处的最佳选项。
Everyone admires heroes. When we are asked 1 are our heroes, someone well-known like Yang Liwei or Zhong Nanshan may come into mind. They make a big difference to the world.2there are "everyday" heroes in our daily life. They may not be so 3to the public, but these common people are also working hard to build a better world.4them is Sun Jun.
Sun Jun comes from a poor village. The villagers used to have no enough food. He knew much about the 5. He learned to 6food at his early age. When he was a college student, he found that the problem of food waste was more and more7. He started to 8unsold food from restaurants and stores for homeless people.
After graduating. Sun Jun joined a volunteer9called Green Food Bank, which was setup in Shanghai in 2014. The purpose of the organization is to build a bridge between people who are ready to help others and those who are 10. It works by collecting and11free food for the poor, the disabled and so on.
Sun's team developed a phone app. It can show how much food restaurants remain each day. Usually, the workplaces of volunteers are not far from the restaurants,12 they can just walk there to get the food for free. Then it can be given out in just a few13.
So far, Sun and his team have done something14to the society. On the one hand. they've saved a lot of food. On the other hand. they've helped some people 15. More volunteers and restaurants join them now. The small actions of these heroes can make a 16 influence than we imagine.
Why does Sun do 17 these things? He says," Thanks to Grandpa Yuan Longping, we are almost no longer short of food. We need to think about how to_18 wasting. There's a long way to go, but I won't19 halfway. It's just the beginning. We still have20to do.