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]: Mature plants can be up to ____ feet tall.
[EX A]: six

[EX Q]: Cattle can have up to six to ____ years of grazing, after which a scrub savannah grows up.
[EX A]: ten

[EX Q]: Troxel helmets have ____ padding systems.
[EX A]:
two