Fill in the blanks with the appropriate set of words :

_________ are seventeen boys in the class. _________ all quiet right now. The teacher asks why _________ work is incomplete.

There, they're, their

The correct set of words to fill in the blanks is:

There are seventeen boys in the class. They're all quiet right now. The teacher asks why their work is incomplete.

• There is used to indicate a place or location.
• They're is a contraction of "they are."
• Their is the possessive form of "they."

In the first sentence, "there are" indicates the location of the seventeen boys, which is in the class.

In the second sentence, "they're all quiet right now" means that all of the boys are quiet at the moment.

In the third sentence, "their work is incomplete" means that the work belonging to the boys is not finished.