【正确答案】：
1)EACH OF THE THREE WORDS CONSISTS OF THREE MORPHEMES UNBEARABLE(UN+BEAR+ABLE), INTERNATIONAL (INTER+NATION+AL), EX-PRISONER(EX+PRISON+ER).
2)OF THE NINE MORPHEMES, ONLY BEAR, NATION AND PRISON ARE FREE MORPHEMES AS THEY CAN EXIST BY THEMSELVES.
3)ALL THE REST UN-,-ABLE, INTER-,-AL, EX-AND-ER ARE BOUND AS NONE OF THEM CAN STAND ALONE AS WORDS.
【题目解析】：1）这三个词中的每一个都包含三个词素：不可忍受（un+bear+able）、国际（inter+nation+al）、前囚犯（ex+prison+er）。2）在九个语素中，只有bear、nation和prison是自由语素，因为它们可以独立存在。3）其余的”un-,-able,inter-,-al, ex-和-er“，都是粘着词素，因为他们都不能作为独立的词存在。