The listener is challenged to complete the sense.
1	The	the	DET	RD	Definite=Def|PronType=Art	2	det	_	_
2	listener	listener	NOUN	S	Number=Sing	4	nsubj:pass	_	_
3	is	be	AUX	VA	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	challenged	challenge	VERB	V	Tense=Past|VerbForm=Part	0	root	_	_
5	to	to	PART	PART	_	6	mark	_	_
6	complete	complete	VERB	V	VerbForm=Inf	4	ccomp	_	_
7	the	the	DET	RD	Definite=Def|PronType=Art	8	det	_	_
8	sense	sense	NOUN	S	Number=Sing	6	obj	_	SpaceAfter=No
9	.	.	PUNCT	FS	_	4	punct	_	_
