{A {horrible|dreadful|terrible|frightening|awful|disturbing}{| and unexpected} thought {struck|hit|occurred to|came to|flashed through|popped into} Harry{| suddenly}|Harry {was struck|was hit|had} {by|with} a {horrible|dreadful|terrible|frightening|awful|disturbing}{| and unexpected} thought{| suddenly}}, as {such {horrible|dreadful|terrible|frightening|awful|disturbing} thoughts|{horrible|dreadful|terrible|frightening|awful|disturbing} thoughts {like these|such as these|of this nature}} {always|inevitably|typically|usually} do when you're {very|extremely|incredibly|particularly|truly|really} nervous{| indeed}{| and anxious}. {What if he wasn't {chosen|selected|picked} at all?|What if they {found|discovered|realized} he wasn't {qualified|eligible|meant} to be {chosen|selected|picked}?|What if he didn't {belong|fit in} at all?|What if this was all {just|simply|merely} a {big|huge} mistake?} {What if he just sat there with the hat over his eyes for {ages|a long time|what seemed like forever|an eternity}|What if the hat {covered|sat on} his eyes for {ages|a long time|what seemed like forever|an eternity} as he just sat there|What if he {remained|stayed} seated with the hat {covering|over} his eyes for {ages|a long time|what seemed like forever|an eternity}}, until Professor McGonagall {jerked|pulled|yanked|took|lifted} it off his head{| with a {frown|sigh|look of disappointment}} and {said|announced|declared|told him|informed him} {there had {obviously|clearly|definitely|undoubtedly|certainly} been a mistake|a mistake had {obviously|clearly|definitely|undoubtedly|certainly} been made}{| of some kind} and {he'd {better|have to|need to} get back on the train|he should return to the train{| immediately}|it would be best if he {went|headed} back to the train{| right away}}?
{A {horrible|dreadful|terrible|frightening|awful|disturbing}{| and unexpected}{| and unwelcome} thought {struck|hit|occurred to|came to|flashed through|popped into}{| the mind of} Harry{| suddenly}{| without warning}|Harry {was struck|was hit|had|was assailed} {by|with} a {horrible|dreadful|terrible|frightening|awful|disturbing}{| and unexpected}{| and unwelcome} thought{| suddenly}{| without warning}|{Suddenly|Without warning|Out of nowhere},{| a} {horrible|dreadful|terrible|frightening|awful|disturbing}{| and unexpected}{| and unwelcome} thought {crossed|entered|invaded} Harry's mind}, as {such {horrible|dreadful|terrible|frightening|awful|disturbing} thoughts|{horrible|dreadful|terrible|frightening|awful|disturbing} thoughts {like these|such as these|of this nature}|thoughts {as {horrible|dreadful|terrible|frightening|awful|disturbing} as this one|this {horrible|dreadful|terrible|frightening|awful|disturbing}}} {always|inevitably|typically|usually|tend to|invariably} do when {you're|you are|one is|a person is} {very|extremely|incredibly|particularly|truly|really|exceptionally} nervous{| indeed}{| and anxious}{| and on edge}. {What if he wasn't {chosen|selected|picked} at all?|What if they {found|discovered|realized|determined} he wasn't {qualified|eligible|meant|suited|fit} to be {chosen|selected|picked}?|What if he didn't {belong|fit in} at all?|What if this was all {just|simply|merely} a {big|huge|terrible|dreadful} mistake?|What if the {whole thing|entire situation} was a mistake?} {What if he just sat there with the hat over his eyes for {ages|a long time|what seemed like forever|an eternity}|What if the hat {covered|sat on|rested on} his eyes for {ages|a long time|what seemed like forever|an eternity} as he just sat there|What if he {remained|stayed|continued} seated with the hat {covering|over|perched on} his eyes for {ages|a long time|what seemed like forever|an eternity}|What if time {stretched on|dragged on|crawled by} {endlessly|interminably} as he sat with the hat {covering|over|blocking} his eyes}, until {Professor McGonagall|McGonagall|the professor} {jerked|pulled|yanked|took|lifted|removed} it off his head{| with a {frown|sigh|look of disappointment|grimace}}{| impatiently} and {said|announced|declared|told him|informed him|stated}{| flatly}{| apologetically} {there had {obviously|clearly|definitely|undoubtedly|certainly|apparently} been a mistake|a mistake had {obviously|clearly|definitely|undoubtedly|certainly|apparently} been made|they had {obviously|clearly|definitely|undoubtedly|certainly|apparently} made a mistake}{| of some kind}{| in his case} and {he'd {better|have to|need to} get back on the train|he should return to the train{| immediately}{| at once}|it would be best if he {went|headed|returned} back to the train{| right away}{| now}|he needed to return to the train{| immediately}{| at once}}?