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: All baleen whales have ____ blow holes.\Question: Choose the right answer from options given a) zero b) four c) seven d) two

SOLUTION: d

PROBLEM: Natural indium contains ____ isotopes.\Question: Choose the right answer from options given a) one b) eight c) two d) seven

SOLUTION: c

PROBLEM: Brain aneurysms occur in ____ per cent of people with the disease.\Question: Choose the right answer from options given a) no b) six c) eight d) ten

SOLUTION:
d