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').

Q: Many tractors have ____ wheel drive to get extra grip on the hills and in wet conditions.\Question: Choose the right answer from options given a) four b) seven c) five d) two

A: a
****
Q: Government buildings fly flags of the ____ nations.\Question: Choose the right answer from options given a) ten b) no c) seven d) two

A: d
****
Q: Gravity is the weakest of all ____ forces but unlike the others it has an unlimited range.\Question: Choose the right answer from options given a) four b) six c) nine d) one

A:
a
****