Ответ:

Similarity, width, freedom, society, popularity, publicity, truth, pluralism, idealism, globalism, activity, brutality, kingdom, imperialism, wisdom, originality, length, depth, possibility, heroism, capitalism, patriotism.

Не знаю, нужно ли Test 2 Task 1, поэтому тоже сделаю :)

Childhood, fulfillment, development, appointment, arrangement, roughness, membership, boyhood, darkness, kindness, friendship, neatness.

Удачи с суффиксами! :)