Expert IELTS 6 p.95

a new or extra thing that is added to something

a unit for measuring area, equal to 4047 square metres

the process of growing, changing, or becoming more advanced

in danger of being harmed, lost, unsuccessful, etc

the best, biggest, longest, tallest, etc

the activity of keeping animals in order to produce young animals

to make certain that something is done

to keep animals in order to produce young animals (verb)

the protection of nature

someone who lives in the area you are talking about