4. Reorder the main ideas according to their occurrence in the text. (00.5pt)
a. Recyclable products.
b. Trees that end up in newspapers .
c. Why is recycling eco-friendly.
d. The importance of energy saving.
1. c. Why is recycling eco-friendly.
2. d. The importance of energy saving.
3. b. Trees that end up in newspapers .
4. a. Recyclable materials.