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]: Female dogs come into heat every ____ months or so.
[A]: six


[Q]: Stereo cameras track the fly's movement in ____ dimensions.
[A]: three


[Q]: Most curable tumors require at least ____ to eight cycle of therapy.
[A]:
six