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: Kayak paddles have ____ blades, canoe paddles have one.

A: two
****
Q: Respiratory therapists complete two to ____ years of education.

A: four
****
Q: Slugs are snail-like mollusks with ____ shells or very small shells.

A:
no
****