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]: Beryllium has ____ protons and four electrons.
[EX A]: four

[EX Q]: Females become sexually mature at the age of ____ years.
[EX A]: five

[EX Q]: Most scientists consider swamp s, marsh es, and bog s to be the ____ major kinds of wetlands.
[EX A]:
three