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.

Cleavage is good in ____ directions at right angles.
two

Arthritis is characterised by ____ major observable changes in the joints.
four

Ticks are small round arachnids with ____ legs and can have either a soft or hard body.

eight