The Browns stood staring at the happy _______ of children playing in the park.

—Can I help you with it?—I appreciate your        , but I can manage it myself.

Please speak in a _______ , or the teacher will hear what you say.

Working hard is not only a _____ of great success, but it is among the essential requirement.

The College Entrance Examination is around the corner, but we should strike a         between study and relaxation.