He devoted himself __________ to his research and got many achievements.

You may not agree, but _______ I think she is a very good girl.

Many people think they have to spend a lot of money to keep healthy. Leading a healthy lifestyle doesn't have to cost much,         . 

These problems are different from each other, so they should be dealt with         .

Although modem organic food has become very popular, many people can' t figure out the difference between organic foods and ______ grown foods．