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]: Most organ systems are operational in the fetus by ____ to six months.
[A]: four


[Q]: Climbers are the most frequent cause of injury for children ____ and older.
[A]: six


[Q]: Newborn apes rely on their mothers for milk and depend on their care for ____ years.
[A]:
five