Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

[Q]: Neuroblasts delaminate in five waves spanning approximately ____ hours.
[A]: three


[Q]: Respiratory therapists complete two to ____ years of education.
[A]: four


[Q]: Men get emphysema about ____ times more often than women do.
[A]:
six