Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.

Have a walk on a beach, listen to the sound of the sea waves, (1)_______ suddenly you see a lot of rubbish on the beach. Pollution takes away all the beauty of our beaches. I feel really very annoyed (2) _________I see plastic bags lying on the sand, cigarette ends buried in the sand, and soda cans floating in the sea. There (3)___________ a lot of things that we can do. If we see rubbish, we should do our part in protecting the land (4)_________ picking it up and throwing it in dust bins. Moreover, we can form some kind of organization that helps (5) _________the beaches. If everyone does their part, the beaches will be a wonderful and beautiful place. We need to start now before the beaches are damaged beyond repair. 

If we see rubbish, we should do our part in protecting the land (4)_________ picking it up and throwing it in dust bins.