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]: Cockroaches have six legs, ____ antennae and some have wings.
[A]: two


[Q]: Cricket usually lays about five eggs, one every other day for ____ days.
[A]: ten


[Q]: Electric charge builds up whenever ____ materials are separated.
[A]:
two