instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Germs have _ means of locomotion execpt to attach themselves to particles of dust.
answer:
no


question:
Sake contains _ preservatives or sulfites.
answer:
no


question:
Rabbits are diphyodont, having _ recognizable sets of teeth.
answer:

two