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: Nightmares happen frequently in childhood, especially between the ages of ____ and six.\Question: Choose the right answer from options given a) three b) eight c) no d) ten

SOLUTION: a

PROBLEM: Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four

SOLUTION: b

PROBLEM: Real shadows have ____ parts, the umbra and penumbra.\Question: Choose the right answer from options given a) nine b) two c) eight d) one

SOLUTION:
b