——What do you think of your parents?
——They are always strict ____ our studies and they often make me ______ too much homework .

•  ____是保持物质化学性质的最小粒子，分子与原子的根本区别是 ____。化学变化的实质是 ____分成 ____又重新组合生成 ____的过程。

阅读下面的古诗，回答相关问题。

                                                                                                      塞外杂咏①
                                                                                                        林则徐
                                                                               天山万笏②耸琼瑶，早我西行伴寂寥。
                                                                               我与山灵相对笑，满头晴雪共难消。
            【注】①此诗作于作者被革职后，西行伊犁途中。②笏：封建时代大臣上朝拿的手板，用象牙、玉石或竹片制成，可以在上面记事。