Complete the sentences with the words below.

Write one or two words in each gap.

equation, process, carbon dioxide, sucking

They have developed a new [ ] of extracting useful substances.

Microbes decompose organic waste into a mixture of methane and [ ].

Melanie was sitting on the grass [ ] lemonade through a straw.

Balancing work and family is hard, but he's trying to come up with the perfect [ ] in that regard.