This English Language quiz is called 'Suffixes 3' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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How can you tell whether to suffix 'ible' or 'able'? Generally, if the word can stand alone, e.g. 'reason', add 'able'. If not, add 'ible', e.g. 'horrible'. As ever in English, there are exceptions!