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

　　她把所有精力都花在料理家務(wù)和照顧孩子上。

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

　　孩子們消耗很多能量，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

　　我認(rèn)為可以肯定地說學(xué)校里很少有學(xué)生肯為學(xué)好功課下功夫。