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: Most bioluminescence is blue for ____ reasons.

A: two
****
Q: Spiders have eight legs and usually have ____ eyes.

A: eight
****
Q: Some alternative antibiotics require three doses per day for ____ days.

A:
ten
****