instruction:
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:
Carbon is able to bond with up to ____ other elements.
answer:
four


question:
Some alternative antibiotics require ____ doses per day for ten days.
answer:
three


question:
Paleontologists study ____ types of fossils.
answer:

two