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]: Neurofibromatosis appears in ____ forms.
[A]: two


[Q]: Blood donors can give blood every ____ weeks, or six times a year.
[A]: eight


[Q]: Tall fescue produces the ____ diazaphenanthrene alkaloids, perlolidone and perloline.
[A]:
two