ndred percent _______ to your studies, though itcan be lonely and no fun at all, will leave precious marks on your youth.

It is so good a habit to instruct children to lay things _______ they belong when they are young.

He is the only one of the students ______from the country in my class, and we have known for quite some time.—Where did you meet for the first time?—It was on the farm ________ I used to work.

_____ out of the difficult situation, the restaurant is now making efforts to improve the quality of service. [ ]

下列各句中，与词语“千里之堤，溃于蚁穴”意思相近的是（ ）