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: Collages can have two or ____ layers.

A: three
****
Q: Light chains exist in ____ classes, lambda and kappa.

A: two
****
Q: Masturbation can get really old after six or ____ years.

A:
seven
****