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: Food chains consist of ____ trophic levels.\Question: Choose the right answer from options given a) ten b) three c) one d) four

SOLUTION: d

PROBLEM: Routers are basically systems, which connect ____ networks together.\Question: Choose the right answer from options given a) three b) two c) nine d) six

SOLUTION: b

PROBLEM: Botanists use ____ different words, 'thorns', spines, and 'prickles'.\Question: Choose the right answer from options given a) four b) seven c) three d) eight

SOLUTION:
c