Does the non-metal need to be processed before it can be used? how is this done

Yes definitely we have to do this

Explanation:

Because of non processed it will may rust then there will be so risk and very harmful bacteria are produced by rust and there is loss too

the jewellery thief was as cunning as a fox.

explanation:

"as cunning as a fox" is the simile, because it compares two things using the words "like" or "as" to do it.