Fill in the blanks with the words given below. Change the form where necessary. scale impact tackle opponent sustain promote establish foundation Water and oxygen are basic needs for human beings to _________ their lives. She is one of the strongest __________ of tax reform. I’ve never seen droughts on such a large _______ The priority is to ___________ the problem. The death of his sister has a great ___________ on him. The aim of this campaign is to _____________ sportsmanship in the oncoming competition. He is the chairman of this ___________. The two companies have ____________ a long-term cooperative relationship.