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]: Earth is the third planet from the Sun in our solar system, which includes ____ other planets.
[A]: seven


[Q]: Sponges have ____ main tissue layers.
[A]: three


[Q]: Climatic regions Contrasts between the interior and the coasts produce ____ main climatic regions.
[A]:
six