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.

[EX Q]: Human feet bear average ____ to six hundreds tons of weight everyday.
[EX A]: five

[EX Q]: Stems are of ____ types, flowering and vegetative.
[EX A]: two

[EX Q]: Pathologists study ____ to five years after medical school and their postgraduate training.
[EX A]:
four