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: Snowflakes are crystals that have many different shapes, but each snowflake has ____ points on it.\Question: Choose the right answer from options given a) six b) nine c) one d) seven

SOLUTION: a

PROBLEM: Malignant tumors are more dangerous, and survival times can range from ____ months to several years.\Question: Choose the right answer from options given a) one b) no c) ten d) six

SOLUTION: d

PROBLEM: Bond angles The bond angle defined by ____ atoms is calculated.\Question: Choose the right answer from options given a) six b) three c) one d) zero

SOLUTION:
b