Group (C) - Spelling Practices

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(1) n. (canxi) silvery, moderately hard metallic element
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(2) n. Syn. enzyme; stimulus(chất xúc tác) agent which brings about chemical change while it remains unaffected and unchanged
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(3) n. Syn. calamity; disaster(thảm họa) calamity; disaster; state of extreme ruin and misfortune
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(4) v. Syn. license; authorize(Điều lệ) license; authorize; hold under a lease or rental agreement of goods and services
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(5) n. (vực thẳm) deep opening in the earth surface
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(6) n. Syn. faction; tribe(tộc) faction; tribe; division of a tribe tracing descent from a common ancestor; a large group of relatives
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(7) v. (phân loại) declare unavailable, as for security reasons; arrange or order by classes or categories
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(8) a. Syn. awkward; inept(vụng) awkward; showing lack of skill or aptitude 
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(9) a. Syn. flammable; burnable; inflammable(cháy) capable of igniting and burning; easily aroused or excited
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(10) a. (tổng hợp) made up of distinct parts or elements; compounded