He has made up his mind to devote his life _________ pollution _________ happily.
Gaining the knowledge ________ environmental protection will help you to become a qualified environmentalist.
— Try not to work yourself too hard. Take it easy.— Thanks. __________
— We have to stop talking here outside. Listen, ________!— Hurry up, or we’ll be late.
I told Sally how to get there, but perhaps I ________ for her.
Many grocery stores use misting, a process ________vegetables are sprayed with water, to keep vegetable fresh.