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').

Trains kill ____ people every year.\Question: Choose the right answer from options given a) zero b) three c) no d) four
d

Many animals use two or ____ forest structure types.\Question: Choose the right answer from options given a) eight b) zero c) two d) three
d

Sheep can be carriers for up to ____ weeks after recovering from the infection.\Question: Choose the right answer from options given a) zero b) nine c) ten d) seven

b