TASK DEFINITION: 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.
PROBLEM: Lancelets display all ____ of the vertebrate characteristics throughout their lives.

SOLUTION: four

PROBLEM: Jersey has nine breeding seabird species, of which ____ nest on the north coast.

SOLUTION: seven

PROBLEM: Bivalves have ____ shells, like a clam or oyster.

SOLUTION:
two