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

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

[EX Q]: Nuclear energy comes in ____ forms, fission and fusion.
[EX A]:
two