Fiveand six-membered rings are the most stable and important, the last-named group resulting from the polymerization of many substances; threeand four-membered rings are formed with difficulty, and are easily ruptured; rings containing seven or more members are generally unstable, and are relatively little known. [Please select]
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Then I 'membered that Mamma said a kiss for a blow was a good thing, so I picked up the beads and planned to do it; but Cis looked SO cross I couldn't. [Please select]
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