1. Ethologists study animal ____ to understand social structures and communication among species.
2. The cheetah is known for its incredible speed, making it the fastest ____ in the animal kingdom.
3. Coral reefs are often referred to as the 'rainforests of the sea' due to their ____ biodiversity.
4. The tiger is a fierce predator that hunts its prey silently.
5. Neither a lion nor a zebra were present at the watering hole during the dry season.
6. Insects are essential for the ecosystems because they pollinate flowers and decompose organic matter.
7. She uses her smartphone every day.
8. They upload photos to the internet.
9. He plays video games on his computer.
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13. The pollution in the river have increased over the last two years.
14. We should use lesser plastic bags to help reduce waste.
15. Where do you think the most effective ways to reduce energy consumption are?
16. She ____ on the internet every evening.
17. I need ____ new charger for my phone.
18. The laptop is ____ the table.