He finds it hard to keep _____ with the change of society if he stops learning.
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.
Meeting my teachers and fellow students after so many years was a warm occasion, ______ I’d strike into my heart.
The director was fully convinced that this moving story, if ______ for television, would be a hit.
The upset mother thought to herself, “If only I ______ what’s going on in my little boy’s head right now.”