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: Rheumatic fever begins one to ____ weeks after an untreated streptococcal infection.\Question: Choose the right answer from options given a) six b) ten c) two d) zero

SOLUTION: a

PROBLEM: Statistics show that within ____ years of divorce, many people marry a second time.\Question: Choose the right answer from options given a) four b) nine c) six d) three

SOLUTION: d

PROBLEM: Comets consist of ____ parts, a tail and a coma.\Question: Choose the right answer from options given a) no b) two c) seven d) zero

SOLUTION:
b