根据短文内容和所给的汉语提示，写出短文空白处各单词的正确形式，每空限填一词。
Miss White is from France. She can speak two____ (语言). She is a ____ (护士). She works in a ____ (医院)at night. She works very____ (努力). She likes to take a walk in a ____ (安静的) place. She likes ____ (动物) . She often goes to the zoo. Her cousin Bob is a reporter. He’s ____ （拍照）photos at the park . It’s____ (寒冷的) today. Look! Some people are swimming at the____ (泳池). Mr White is____ （感到惊讶的）to see it.

已知方程 $ax+5=13$ 的解是x=2，则 $a$的值为（       ）.

Ⅰ．日常生活中化学无处不在，从石墨、二氧化硫、熟石灰、醋酸、碳酸氢铵等物质中，选择与下列叙述相应的物质，用化学式填空：