TASK DEFINITION: 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.
PROBLEM: Neurofibromatosis appears in ____ forms.

SOLUTION: two

PROBLEM: Rattlesnakes breed only every ____ to three years.

SOLUTION: two

PROBLEM: Trees can also be air layered but air layering usually takes ____ to six months to be successful.

SOLUTION:
four