TASK DEFINITION: Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').
PROBLEM: Some families have two daddies or ____ mommies.\Question: Choose the right answer from options given a) nine b) seven c) zero d) two

SOLUTION: d

PROBLEM: Natural tellurium consists of ____ isotopes.\Question: Choose the right answer from options given a) six b) seven c) eight d) one

SOLUTION: c

PROBLEM: All plants take ____ generations to complete one life cycle.\Question: Choose the right answer from options given a) ten b) zero c) two d) five

SOLUTION:
c