All the students ______ their study _______ all the lights went out.

依次填入下面一段文字横线处的语句，衔接最恰当的一组是(　　)幸福是什么 ， 。 。 ， ， 。一旦人的精神需要、情感诉求和心理期待无法获得充分满足和应有尊重，幸福的天平就会在失衡中倒向失望、叹息和迷茫、无助的另一端。 ①唯其如此，幸福才会不经意间来敲门②它是实践付出和心理满足的和谐一致③幸福固然包含着物质层面的拥有和满足④所以，幸福也可以狭义地理解为人的精神寄托、心灵安顿与人格实现⑤但更多指涉精神层面的感受⑥是健康、情感、财富和理想等生活要素的一种和谐共振状态

It seems that living green is_____ easy and affordable A small step makes a big difference[ ]

One of our rules is that every student ______wear school uniform while at school.

If you want to book tickets for a film in Qionghai, just call 62838009. It _______be simpler.