This English Language quiz is called 'Spelling (Plurals for words ending in o)' 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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For some words which end in -o add -es to form their plurals, for example 'hero'/'heroes'. Here is an English spelling quiz so you can get to grips with the subject. Be warned...not all plurals for words ending in 'o' require an 'e'.