expend的名词形式怎么写

　　She expended all her efforts on the care of home and children.

　　她把所有精力都花在料理家务和照顾孩子上。

　　Children expend a lot of energy and may need more high-energy food than adults.

　　孩子们消耗很多能量，可能比成年人需要更多高能量的食物。

　　I think it is safe to say that very few students expend the effort to do quality work in school

　　我认为可以肯定地说学校里很少有学生肯为学好功课下功夫。