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: Luminosity decreases by almost four orders of magnitude in approximately ____ million years.

A: five
****
Q: Every isometry is the composition of one, two, or ____ reflections .

A: three
****
Q: Most births produce a single offspring, but twins are born ____ out of every six or seven births.

A:
one
****