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]: Variable stars fall into ____ major physical classifications.
[EX A]: four

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

[EX Q]: Cartilage is also slippery ____ to eight times more slippery than ice.
[EX A]:
five