.............. do not pass electricity through them.

Explanation

To answer the question "________ do not pass electricity through them," we need to identify the type of materials that do not conduct electricity.

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking for a term that describes materials that do not allow electricity to flow through them.

2. **Identifying the Type of Materials**: We need to think about materials that are known for not conducting electricity. Common examples include rubber and wood.

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