Помогите пожалуйста очень нужно!!!!II.

Fill in the words and translate the sentences.

a) environment

d) nature

g) lessen

b) century

e) during

h) science

c) save

f) protection

i) pollution

1) People all over the world are worried about the ____ of our_____. 2) The branch of ____ which deals with the relation of living things to their ____ is called ecology. 3) The environmental ____ is one of the most important problems of mankind. 4) Considerable progress was made ____ the second half of the 20th ____ . 5) The mankind should first of all _____ pollution. 6) We must do everything possible to _____ the nature.