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.

Owls have ____ toes on each foot, like most birds.
four

Lunar eclipses occur every ____ months, on average.
six

Fluorescent lights are four to ____ times more efficient than incandescent bulbs.

five