It seems some of the strike-out answers are the right ones...
Like the first one, I would have chosen "learn to speak the language" as assimilation. If that is wrong, then go with experience little or no discrimination.
Same for the second one, I would have chosen "forbidding children to speak language" as internal control. If that is wrong, then go with Hosting ethnic festivals.
Third one is easy - race is by birth but it does not mean you belong. So the answer is I, II and IV.
Fourth one is tough - III is wrong so two choices are eliminated. If I & II is wrong, then go with II and IV.
Fifth one is easy - it is spread of disease.
