题目

86. We should take exercise regular, which will be good to our health. 87. He asked me what I should deal with the waste newspaper.                        88. He said he had been used to get up early every morning. 89. I doubt that he will pass the final term examination. 90. I left school in 1980,and since then I lived in Jilin city. 答案：86:  regular--- regularly      87: what – how 或 deal – do   88: get- getting       89:  that – whether          90: live 前加have       84: to be explored    85: personally（本小题满分10分）     在△ABC中，a、b、c分别是角A、B、C所对的边，且    （I）求c；   （II）若的最大值。