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.

Example Input: Young bees spend the first ____ to three weeks of their lives carrying out functions within the hive.
Example Output: one

Example Input: Cats have five toes on their front paws, but only ____ touch the ground when walking.
Example Output: four

Example Input: Friction is produced when ____ materials rub against each other.
Example Output:
two