正在研发新技术来净化受污染的土壤。

New technologies are being developed to ___clean ___up contaminated soil.

当地志愿者正在组织本周末的海滩清理日活动。

Local volunteers are organizing a day to ___clean ___up the beach this weekend.

政府已经启动了一个大型项目来清理城市受污染的水道。

The government has launched a major project to ___clean ___up the city's polluted waterways.