This challenging worksheet stretches confident readers with multiple-choice puzzles that test deeper CVC reasoning. Students spot the odd word out in the -ob family (cob, sob, rob versus rub), swap the vowel in dab to build dub, identify hem as the only word with a short e, and pick hub and rub as the rhyming pair. The fill-in-blank section then asks them to name the shared -ub ending of nub, hub, and rub, transform vim into rim, supply tap as a CVC word meaning 'to hit gently,' and isolate the final /k/ sound in yak — all skills that prepare first graders for the rapid pattern recognition reading demands.