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: Electric power means no gas or oil to spill, and ____ pollution in the air.

SOLUTION: no

PROBLEM: Photons have ____ mass and no electrical charge.

SOLUTION: no

PROBLEM: Females normally have ____ X chromosomes.

SOLUTION:
two