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.

[EX Q]: All crabs have ____ pair of chelipeds and four pairs of walking legs .
[EX A]: one

[EX Q]: Scientists think that macaws mate for life, producing one to ____ young each year.
[EX A]: three

[EX Q]: Happiness is ____ kinds of ice cream.
[EX A]:
two