Ⅰ.根据所给汉语释义或单词首字母写出空缺处各单词的正确形式
1When the iron is heated，it e______，while most substances will ______ when it gets cold in winter.
2Man can't e______ without food and water.
3Air is a m______ of gases.
4They came to a c______ that a new hospital should be built in this city.
5The hunter a______ his gun at the bear carefully.
