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: Neutrons consist of one up quark and ____ down quarks.

SOLUTION: two

PROBLEM: Plants grow up to ____ feet tall and spread to about three feet.

SOLUTION: three

PROBLEM: Gestation is ____ to three months in most species.

SOLUTION:
two