Dưới đây là những từ thích hợp để điền vào chỗ trống:

1. **New** car models always attract great attention at exhibitions.
2. Remember to turn off your **lights** when they are not used.
3. Small changes in your daily habit can help reduce the **waste** you produce.
4. One of the most sustainable sources of **energy** is from the sun.
5. Students are reminded to pick up **litter** that they see on the ground.

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