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.

Sealants can normally last up to ____ years and hold up very well under normal chewing.
five

Light chains exist in ____ classes, lambda and kappa.
two

Meat can stay in the warmth of the intestine for at least ____ days until it is digested.

four

