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walking walk to walk walking
is about to take off is taking off takes off was taking off
spends ; to walk spends ; walking takes ; to walk takes ; walking
interesting dangerous convenient difficult
the fifteen fifteenth the fifteenth fifteen
has come had arrived had been came
walking to walk walk walks
How long How soon How often How far
touch distance speed reach
five more minutes more five minutes another five minute five another minutes
How far, twenty-five How long, twenty-five How far, twenty five How long, twenty five
cost; to get takes; getting takes; to get takes; to get to
solving；in five minutes to solve；in five-minute to solve；after five minutes solving；after five-minutes
has come had arrived . had been . came
how far how long how often how soon
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