In America，primary school lasts six years. There are about twenty students in one class. They are in different groups. Different groups may have different textbooks. The whole grade graduate(毕业)at the same time，but the students learn different knowledge.

    Primary school students don't have schoolbags. Their books are in the school. The students usually study reading，arithmetic(算术)，language，science，music，art and PE. The performances(成绩)show three grades. G means good. S means satisfaction. N means you need to work hard.

下列横线上，依次填入词语最恰当的一项是（      ）
①鸟儿将巢安在繁花嫩叶当中，高兴起来了，呼朋引伴地　　 　  清脆的喉咙。
②莫言获诺贝尔文学奖后迅速占领了2012年中国作家富豪榜的榜眼位置。不论诺贝尔文学奖的评价标尺如何惹人争议，但是它的经济乘数效应却　　 　　　 ，而且不分国界。
③夏洛克，你自己可以去查查明白。        你要求公道，我　    给你公道，而且比你所要求的更地道。