电解氢氧化钠稀溶液与电解水的原理均可表示为：2H₂O $\frac{\underset{\_}{通电}}{}$ 2H₂↑+O₂↑．电解一定质量氢氧化钠稀溶液的过程中，下列说法正确的是（   ）

根据课文和首字母填空。
    Sandy and Sue are in a shop. They want to buy two p____ of sweets，but they are one shilling e____. That's all their p____ money. At last, they buy two small lollipops i____.
    In the afternoon, Sandy and Sue come back home from school. Tea's r____. Sandy and Sue are very h____, but Sandy's hands are very d____. Mother asks Sandy to go and w____ his hands at o____. Now Sandy's hands are clean. Look at Mum's nice clean t____! Sandy cleans his hands with it.
    On Sunday, Sue and Mum are going shopping. Mum sees a pair of nice s____, so she wants Sue to t____ them on. They are very t____ for Sue. Sue wants the pink ones and she thinks they're very p____. They're j____ right.

某市对电话费作了调整,原市话费为每3分钟0.2元(不足3分钟按3分钟计算).调整后,前3分钟为0.2元,以后每分钟收0.1元(不足1分钟按1分钟计算).设通话时间x分钟时,调整前的话费为y₁元,调整后的话费为y₂元.

开发新材料是现代科技发展的方向之一。下列有关材料的说法正确的是

语法填空

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或者使用括号中词语的正确形式填空。

Mr Jones had a few days’ holiday, so he decided to go on a trip. He put  ____ his best clothes, took a small bag, ____(go) to the train station and got on the train. He had a 18. ____(beauty) hat, and he often put his head out of the window ____(see) the mountains during the trip. Suddenly, the wind  ____(blow) away his hat.

  Mr Jones  ____(quick) took his bag and threw it out of the window.. ____(other) on the train laughed and said, “Is your bag going to bring your hat  ____?”

  “No,” Mr Jones answered, “but there is no name or address on my hat, and there ____(be) a name and ____ address on the bag. Someone will find both of them, and he will send the bag and the hat back to me.”