1．It never occurred to me __that__ you could succeed in persuading him to change his mind.
解析 此处为“it occurs/occurred to sb that…”结构，that引导主语从句， it为形式主语。句意：我真想不到你竟然说服了他，让他改变了主意。
2．Achieving these goals will not only further your career, but it will also give you a sense of __accomplishment__(accomplish) and confidence.
解析 句意：实现这些目标不仅会推动你的事业发展，同时也会提升你的成就感和自信心。
3．Closer inspection by the health officers showed that the canned fruit were considered unfit __for__ human consumption.
解析 unfit for不适合于……。句意：卫生检疫所工作人员仔细检查后表明这些水果罐头不宜供人们食用。
