My mother is a teacher of E____. She is very k____ to her students. She always h____ them with their lessons. After class she often t____ to them and l____ to them carefully. My mother loves her job and she is n____ be late for work. She goes to work on foot. It takes her h____ an hour to get to school. All the pupils in my class like her i____ class.

民族精神是一个民族赖以生存和发展的精神支柱。中华民族精神的核心是 （）

如图所示是水与酒精相混合的实验，当把50mL的水和带有颜色的50mL酒精混合后，发现过一会，量筒内液体的颜色变得均匀，并且混合后的液体总体积小于100mL，由此你提出的猜想是 ____．猜想的依据是 ____

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