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]: Cleavage is good in ____ directions at right angles.
[A]: two


[Q]: Gloves have ____ ridges or crevices in which the bacteria can hide.
[A]: no


[Q]: Most jet airplanes have two, three, or ____ engines, depending on aircraft size.
[A]:
four