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.
Example: Female snakes incubate eggs inside of their bodies, giving birth to live young of ____ or more.
Example solution: ten
Example explanation: Snakes give birth to minimum ten young ones so ten is a correct answer.

Problem: Polypropylene comes in ____ types.

Solution: two