instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Tensors have an associated rank from _ to infinity.
answer:
zero


question:
Morocco has _ perennial rivers and many dams have been built with potential for power generation.
answer:
four


question:
Carbon atoms are tetravalent, and therefore, can have _ bonding pairs around each carbon atom.
answer:

four