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]: Object permanence is seen in children ____ to twelve months old .
[A]: eight


[Q]: Many infected dogs exhibit ____ symptoms until the disease is in an advanced state.
[A]: no


[Q]: Frustration is caused by ____ factors - equipment and environment.
[A]:
two