In this task, you are given a sentence and a verb from the sentence. Your task is to generate a set of wh-questions starting with who, what, when, where, why, how, how much. The generated questions must contain the verb and the answers to these questions are phrases in the input sentence. The answer to the questions is associated with a specific semantic role. The answer to these questions is associated with a specific semantic role. The questions must use pronouns instead of direct nouns that could be used to refer to various roles present in the sentence. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is unique (iii) its answer is a continuous text span from the paragraph.

Sentence: The plan outlined policy measures the candidates pledged to support in the United States presidential election , 2008 . 
 Verb: pledged
what is  pledged?

Sentence: Having finished his apprenticeship with Hammond , Keats registered as a medical student at Guy 's Hospital and began studying there in October 1815 . 
 Verb: registered
who   registered  as something?

Sentence: Since there was nothing objectionable in it , most likely it was somehow lost by Bentley 's printer when the `` Etymology '' and `` Extracts '' were moved . 
 Verb: lost

how might something have been lost?