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: Physical abuse occurs in approximately one out of every ____ dating relationships.\Question: Choose the right answer from options given a) six b) four c) one d) ten

SOLUTION: b

PROBLEM: Food waste is transformed into soil-like humus in ____ to seven days.\Question: Choose the right answer from options given a) ten b) five c) zero d) three

SOLUTION: d

PROBLEM: Cephalopods are the only mollusks with a closed circulatory system with ____ hearts.\Question: Choose the right answer from options given a) five b) seven c) no d) three

SOLUTION:
d