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: Insects have ____ common types of metamorphosis.\Question: Choose the right answer from options given a) six b) eight c) two d) seven

SOLUTION: c

PROBLEM: Water weighs about ____ pounds per gallon.\Question: Choose the right answer from options given a) seven b) ten c) zero d) nine

SOLUTION: b

PROBLEM: Some researchers indicate that ____ out of five young people have had sex by the age of thirteen.\Question: Choose the right answer from options given a) six b) no c) three d) one

SOLUTION:
d