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: Bullying is most severe in grades ____ to nine.

A: seven
****
Q: Teething begins for most babies around ____ to six months.

A: four
****
Q: Most colorblind animals have ____ sets of opsin genes.

A:
two
****