effect , recovery , danger, creature, temperature, heat, products, variety , pollution, enviroment
1. My neighbor's dog is a very ferocious ___
2 . This stove doesn't give out much__
3 . Her grandmother was very ill, but now she is out of ___
4. His father gor a quick__ from his operation
5. A noisy room is not a suitable ___ to work in
6. _____ in air reduces the visibility near the airport
7.His father works at a company famous for its high-quality____
8. the experience has had a positive ____ on us
9. That man led a life full of change and____
10. It's best to keep our house at an even___

1. To cover                   a. many mysteries of the undersea world
2. To provide                b.our seafood responsibly
3. To reveal                  c.save sea animals
4. To make                   d.the inreractions between teacher and students
5. To require                e. a very low birth rate
6. To keep                    f.organizations to protect the oceans
7. To choose                g. 75% of the earth's surface
8. To swim                   h. taking plastic bags to the beach
9. To have                    i. a balanced enviroment
10. To help                   j. in the horizontal position
11. To avoid                 k. a wide range of information 
12. To join                    l. water clean