Задание 
Match the words with the definitions.
Write the number of the definition near the word.
A process [ ]
Carbon dioxide [ ]
An equation [ ]
To suck [ ]
The act of considering one thing to be the same as or equal to another.
A series of actions that you take in order to achieve a result.
To pull in liquid or air through one's mouth without using one's teeth.
The gas formed when carbon is burned, or when people or animals breathe out.