16:check1.④2.⑤3.③exercise1.②2.①3.⑤4.②5.①6.③/17check1.③2.⑤1.⑤2.③3.④4.⑤/181.②2.③3.②4.③5.④6.④7.①8.④9.⑤10.②11.⑤12.④/191.②2.②
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