It was with great joy _______ he received the news _ his lost son would soon return home.
The teacher is much kinder to the top students, ______ makes the others unhappy.
Too much work and too little rest ____ to his illness.
Some experts demanded that children _______ time for sleep and play.
This type of jewelry is ______, so you’d better buy some as soon as possible.
_____ has already been pointed out , grammar is not a set of dead rules.