22. Garbage is____ a that makes the ocean dirty.
A. pollute B. polluted C. pollution D. pollutant
23. We have to try our best to save the____ species.
A. danger B. dangerous C. endanger D. endangered
24. It seems that we haven’t realized the_____ we are causing to the nature.
A. harm B. harmful C. harmfulness D. harmfully
25. A group of scientists have discovered a strange_____ that lives deep in the ocean.
A. create B. creation C. creator D. creature