One possibility is that tears get rid of certain chemicals from your body _____ build up during stress.
The findings support another study which showed that being happy ______ reduce the risk of heart disease.
If you want to get your ability ______, you have to show it in your work rather than complain all day.
It is believed that high achievers are ambitious, hard working, and work toward personal standards of excellence ______ material rewards.
There is a common belief among the students in our school ______ they should try their best to learn and reach the peak of their academic performances.
— How is that, Jane?— I wonder ______ it takes to be a good teacher beyond patience and a great knowledge of students.