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.

Kayak paddles have ____ blades, canoe paddles have one.
two

Seismologists offer ____ major theories for the occurrence of large, deep earthquakes.
three

Most babies pass through the first ____ months of life without any problems.

six