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]: Flat screens come in ____ varieties, analog and digital.
[EX A]: two

[EX Q]: Raindrops produce ____ types of sound underwater.
[EX A]: two

[EX Q]: Fruit flies have three pairs of autosomes and ____ pair of sex chromosomes.
[EX A]:
one