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: Sexual maturity occurs at three to four years for females and ____ to five years for males.\Question: Choose the right answer from options given a) nine b) seven c) five d) four

SOLUTION: d

PROBLEM: All loci have ____ or two alleles.\Question: Choose the right answer from options given a) no b) six c) four d) one

SOLUTION: d

PROBLEM: Birds have ____ eyelids, and so do dogs and cats.\Question: Choose the right answer from options given a) three b) six c) no d) zero

SOLUTION:
a