91.convenient adj 方便的,便利的92.sooner or later 迟早,早晚93.more or less 或多或少,差不多,几乎94.once in a while 偶尔,时不时地95.now and then 偶尔,有时96. willingly adv 情愿地97. unexpectedly adv 出乎意料地98.unwillingly adv 不情愿地99. unforgettable adj 难忘的100.doubtful adj 可疑的;令人生疑的;疑心的;不能确定的