Pro-form is a generic term that refers to all different types of words that replace another lexical item or expression within a certain text. Sometimes, they may have neutral meanings, performing only a grammatical function. In other situations, they may convey some general or more precise meaning. Based on this characterization, read the sentences below and mark the one that contains a correct example of a pro-form in bold. )

 Every now and then, people come around this square to litter everything.

Mary is so sure that Dave will not forget about the bills to be paid.

 Janet¿s car is broken again.

 My parents and my wife prepared a great surprise to me.

My dad tried to explain the situation, but she just didn¿t want to listen.