1.

2. They had a ________ time in Halong Bay last summer. (wonder)

3. This form must have the ______ of the writer. (sign)

4. Compost is a wonderful _______. It helps plants grow. (fertilize)

5. This river is very _____ for children to swim. (danger)

6. Linda is one of the _______ from Friends of the Earth. (represent)

7. Our teacher always _____ us to study hard. (courage)

8. Waste paper can be _______ after being recycling. (use)

9. Share your _______ story with our readers! (recycle)

10. These products are _______ friendly. (environment)