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').

Cigarette smokers are ____ times more likely to die of lung cancer than nonsmokers.\Question: Choose the right answer from options given a) ten b) six c) four d) nine
a

Bacteria come in ____ basic shapes.\Question: Choose the right answer from options given a) five b) one c) three d) nine
c

Fluorescent lamps are much more efficient than incandescent bulbs and last ____ to ten times longer.\Question: Choose the right answer from options given a) two b) no c) seven d) six

d