Ответ:

1) prejudice 2) American dream 3) coexist 4) culture shock 5) citizenship test 6) diversity 7) lingua franca 8) indigenous 9) segregation 10) melting pot 11) country of origin  

a) the state or quality of being varied or different - 6) diversity

b) originating in and characteristic of a particular region or country - 8) indigenous

c) any language that is widely used as a means of communication among speakers of other languages - 7) lingua franca

d) the country a person originally comes from - 11) country of origin  

e) a test that people who are applying for citizenship of a country have to pass to become full citizens - 5) citizenship test

f) is an opinion formed beforehand, especially an unfavorable one based on inadequate facts, may refer to a particular social group - 1) prejudice

g) an environment in which many ideas and races are socially assimilated - 3) coexist

h) a social system that provides separate facilities for minority groups - 9) segregation

i) to live in peace with each other, especially as a matter of policy - 10) melting pot

j) the belief that everyone in the US has the chance to be successful and happy if they work hard - 2) American dream

k) it is a disorientation of a person when visiting a new country either as a tourist or immigrant – 4) culture shock