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.

Q: Spermatogenesis creates ____ sperm of equal size.

A: four
****
Q: Background color can be a transition of ____ colors.

A: two
****
Q: Teenagers develop colds about as often as adults do-two to ____ times a year.

A:
four
****