5. Fill in the blanks with an appropriate word in each gap.

The environment (a) - various things. All the things of the environment are related to (b) - another. Any change in the ecosystem can (c)- all the other parts. To prevent the environment from destruction is the (d) - of human beings. The environment should be (e) - neat and clean to enjoy a healthy and comfortable (f) -. But people are not (g) - of the dangerous effect of the eocological change. They do unwise things and bring about dangers for their own (h) - Imbalance in the eocology brings about climatic (i) - and the result of the change is various natural (j)- .