Task reminder: Follow the transcript as the audio plays. Type the missing word in each blank exactly as heard. Spelling must be precise.

1. Sample Audio 1 — Renewable Energy

The cost of solar panels has fallen by more than ninety percent over the (1) decade, making solar power increasingly (2) with fossil fuels. Wind energy has seen similar (3) . The main challenge for renewable energy remains (4) , as solar and wind power is only generated when conditions are (5) .

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2. Sample Audio 2 — The Human Brain

The human brain contains approximately eighty-six billion (1) , connected by trillions of synapses. Different regions of the brain are (2) for different functions: the hippocampus plays a key role in memory (3) , the amygdala processes emotions, and the prefrontal cortex is involved in (4) and planning. The brain consumes around twenty percent of the body’s total (5) despite accounting for only two percent of body weight.

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