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: Variable stars fall into ____ major physical classifications.

A: four
****
Q: Most internal parasites are specific to ____ or two species.

A:
one
****