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: Water weighs about ____ pounds per gallon.\Question: Choose the right answer from options given a) seven b) ten c) zero d) nine

SOLUTION: b

PROBLEM: Electrons have almost ____ mass and are negatively charged.\Question: Choose the right answer from options given a) three b) seven c) zero d) no

SOLUTION: d

PROBLEM: Tumors usually shrink within ____ to two days of therapy.\Question: Choose the right answer from options given a) one b) seven c) nine d) five

SOLUTION:
a