—My bike ________. May I go ________? 

—No problem!

A．broke, by yours

B．broke down, on yours

C．was broken down, on yours

D．is broken, on yourself

已知等差数列{a_n}的前n项和为S_n，且S₈＞S₉＞S₇，下列结论中：①d＞0；②S₁₅＞0；③S₁₆＜0；④S₁₇＞0；⑤S₁₀＜S₇正确的结论是_________．