The other half will consist of words not taught but having the exact statistical degree of difficulty. If the posttest gains on both parts are the same, the gains can be attributed to natural incidental learning rather than the textbook. Schools interested in having their spelling program scientifically evaluated should contact Don McCabe, the Research Director of the AVKO Foundation. All heteronyms are identified by the use of bold italics . All homophones are identified by bold letters .
Acts is a homophone of ax and axe .
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