Group (7) - Spelling Practices

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(1) kind of gas they were using to fill the balloon
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(2) branch of zoology that deals with study of fishes
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(3) difficult to perceive senses or mind
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(4) dispute or contradict, often in insulting way; challenge
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(5) beginning of something; taking in, as by swallowing; process of receiving within
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(6) indisputable; not open to question
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(7) in the beginning; at first
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(8) formal or official examination
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(9) overwhelming; incapable of being passed over or overcome
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(10) formed into a whole; introduced into another entity