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: Copper has ____ naturally occurring isotopes.

SOLUTION: two

PROBLEM: Anapsids have ____ openings in the temporal region of their skull.

SOLUTION: no

PROBLEM: Foxes have an average home range varying from ____ to four miles.

SOLUTION:
one