notice与observe 有何区别？ (求教一道英语题)

eg: To tell you the truth,I didn't ______ when she went out of the office , because I have no time to ______ her.
answer: (notice; observe)

remark observe notice 的用法与区别 remark observe notice的区别 scan与observe的区别 notice,see,watch,observe使用上有何区别？要详解 notice与notification 的区别 realize与notice 的区别 I notice so.与SO I notice.有什么区别? attention 与 notice 作为通知时,有什么区别 单词observe意思理解？ notice是什么意思？