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: Ascidian tunicates come in ____ main forms.\Question: Choose the right answer from options given a) three b) zero c) four d) eight

SOLUTION: a

PROBLEM: Laparoscopic surgery is performed via three or ____ small incisions in the abdomen.\Question: Choose the right answer from options given a) nine b) six c) five d) four

SOLUTION: d

PROBLEM: Anemone consists of ____ vents that often play independently.\Question: Choose the right answer from options given a) two b) no c) three d) eight

SOLUTION:
a