阅读下面古诗，回答问题

次韵雪后书事二首（其一）

惆怅江头几树梅，杖藜行绕去还来。

前时雪压无寻处，昨夜月明依旧开。

折寄遥怜人似玉，相思应恨劫成灰。

沉吟日落寒鸦起，却望柴荆独自回。

I____  ____(下棋) yesterday.

观察DNA和RNA在细胞中的分布，所运用的原理是

下列语句中，加点的成语使用最恰当的一句是         （   ）

完形填空   
     Today is June 1st.It's 1^.My friends and I like to play sports2Children's Day. We 3 May Day on May 1st.My mum and dad 4 to stay at home on that day. National Day is on 5^.We go to the park on National Day. The Spring Festival is6 January 7February. My family and I eat 8 during that holiday. September 10th is 9.^.My classmates and I like to make cards for our 10 on that day.