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.

Photosynthesis has ____ main sets of reactions.
two

Edges Usually refers to the ____ outside edges of the pages of a book.
three

Serial transfer is the sequential transmission of the ____ bit-voltages that constitute a byte.

eight