阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
A composting（堆肥） program at The Wesley School in Los Angeles is helping students get hands-on experience and ways （handle）human-driven climate change. For the past year, all the leftover food waste from the school has gone into composting containers rather than a landfill it would be buried and would produce planet-warming gases.
The school's composting program（come）into being in 2022, and this year, the school held a （celebrate）to reveal what happened inside a series of five-foot-tall containers. Steven Wynbrandt, a local farmer composting consultant who has helped the school with its program, broke the ties that held the container closed. Rich black compost spilled out from the container.
The school will use the compost on plants around campus. Some will （offer）to families that want to use it at home, and whatever is left will be donated.
It takes two hours for the container to be emptied and prepared to receive next day's lunch leftovers. The other containers remain full of food waste that is in the process of （break）down. Decorated （poster）on the outside of each container indicate when they can be opened so that the next generation of plants on campus can benefit the rich soil.
