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]: Plants grow up to ____ feet tall and spread to about three feet.
[EX A]: three

[EX Q]: Groundhogs usually have ____ separate dens.
[EX A]: two

[EX Q]: Lenses have ____ main shapes .
[EX A]:
three