Read the extract below and choose the only verb form which is NOT in the passive voice.

"We know the batlle ahead will be long. But always remember that, no matter what obstacles stand in our way, nothing can stand in the way of the power of millions of voices calling for change. We have been told we cannot do this by a chorus of cynics. And they will only grow louder and more dissonant in the weeks and months to come. ( ... )

For when we have faced down impossible odds, when we've been told we're not ready or that we shouldn't try ar that we can't, generations of Americans have responded with a sim pie creed that sums up the spirit of a people: Yes, we cano Yes, we cano It was whispered by slaves and abolitionists as they blazed a trail towards freedom through the darkest of nights: Yes, we cano It was sung by immigrants as they struck out from distant shores and pioneers who pushed westward against an unforgiving wilderness: Yes, we can.

(http://www.nytimes.com/2008/01/08/us/politics/08text-obama.html)