Вместо пропусков вставьте необходимые по смыслу предлоги:
Every substance has a melting point and a boiling point. The former is the temperature ___ which it changes ___ solid ___ liquid. The latter is the temperature ___which it changes ___ liquid ___ gas. These changes are called changes ___state. Sometimes the properties ___ a substance change when it changes its state. ___ example, if the temperature ___ oxygen falls below -183 C, it changes ___ a colourless gas ___ a bluish liquid, which is highly magnetic.