Problem: Here's a question: Where can you buy previously owned metal items?  Here are possible answers to this question: - instruments - hobby lobby - junkyard - ore - car  I believe the correct choice is "junkyard", here's why:

A: the place where metal is sold is in the junkyard


Problem: Given the question: Here's a question: What could hydrogen be added to to cause it to explode?  Here are possible answers to this question: - universe - chemistry lab - ocean - texas - air  I believe the correct choice is "air", here's why:
++++++++++++++++++++++++++++++++
The answer is:
the mixture between air and hydrogen can generate a bomb


input question: Here's a question: Sam thought that his efforts were necessary, but in reality the accomplished nothing.  They were what?  Here are possible answers to this question: - superfluous - useless - swap cs - unneeded - useless  I believe the correct choice is "useless", here's why:???
output answer: useless activities would accomplish nothing in a task


Here's a question: Authors have a wide range of emotions from relief to happiness when they finally what?  Here are possible answers to this question: - complete writing - write books - word passage - start book - write poems  I believe the correct choice is "complete writing", here's why:
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Answer: completing something takes time and effort.


Q: Here's a question: Where could you find passengers that are planning to travel to another continent?  Here are possible answers to this question: - car - bus depot - bus stop - library - airport  I believe the correct choice is "airport", here's why:
A: they use only flights for transportation


[Q]: Here's a question: Where can one attend a famous bazaar?  Here are possible answers to this question: - china - festival - istanbul - arabia - india  I believe the correct choice is "india", here's why:
****
[A]:
shop in india country