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]: Kayak paddles have ____ blades, canoe paddles have one.
[A]: two


[Q]: Arthritis is characterised by ____ major observable changes in the joints.
[A]: four


[Q]: Autism is a developmental disability that often appears during the first ____ years of life.
[A]:
three