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.
--------
Question: Copper has ____ naturally occurring isotopes.

Answer: two


Question: Infertility affects one in ____ couples today.

Answer: five


Question: Grasshoppers can fly at speeds up to ____ miles per hour.

Answer:
eight