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: Some babies start sleeping through the night on their own around three or ____ months.

A: four
****
Q: Plants produce seed at ____ years of age.

A: eight
****
Q: Birds have ____ basic types of feathers.

A:
three
****