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: Many churches have ____ windows on each side of the nave, numbers some consider holy.

A: seven
****
Q: Copper has ____ naturally occurring isotopes.

A: two
****
Q: Aerodynamic missiles are of ____ types.

A:
four
****