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.
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Question: Lung disease is America's number ____ killer, responsible for one in seven deaths.

Answer: three

Question: Gloves have ____ ridges or crevices in which the bacteria can hide.

Answer: no

Question: Scorpions have pincers, ____ legs and a long tail with a stinger at the tip.

Answer:
eight