`1.` Abundant:
`→` The ocean is abundant in fish.
`2.` Alternative:
`→` He had to make an alternative arrangement.
`3.` Available:
`→` He wasn't available to do his assignments.
`4.` Biogas:
`→` Biogas is commonly used in rural areas as cooking gas.
`5.` 
`→`
`6.` Coal:
`→` Charlie has put some coal in the fire already.
`7.` Consumption:
`→` The food was unfit for human consumption.
`8.` Electricity:
`→` They shut the electricity off because Tim forgot to pay the bill again.
`9.` Energy:
`→` My dog is always full of energy.
`10.` Exhausted:
`→` I was so week. Even a short walk exhausted me.
`11.` Fossil:
`→` Fossil fuels are non-renewable and rapidly running out.
`12.` Replace:
`→` He was hired to replace the previous worker.