So heavy is his _______ that he is as busy as a bee, unable to spare(抽出) even a day for his family in a month.

Henry hurried to the library, only to find a notice at the gate, saying “No___________before 12:00 noon”.

I’ve listened to Professor Smith’s talk about medicine,but I still haven’t got a good understanding of its key _________.

We appreciated his______of time and money to the project.

Much to my _____, the student has come to realize the importance of honesty.