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: Reverse osmosis uses three to ____ gallons of water to produce one gallon of drinking water.\Question: Choose the right answer from options given a) six b) eight c) five d) ten

SOLUTION: d

PROBLEM: Calves can swim ____ days after they are born.\Question: Choose the right answer from options given a) ten b) two c) zero d) one

SOLUTION: b

PROBLEM: Sexual reproduction involves two parents, ____ male and one female.\Question: Choose the right answer from options given a) eight b) four c) seven d) one

SOLUTION:
d