Context:
How to rack a pool table<br>Start off with the 1-ball at the front of the rack. This is also called the " apex " of the rack Make sure that the 8-ball is in the center of the rack. The center of the rack is the middle of the triangle.
Hypothesis: It is mandatory to rack a pool table before playing.
It's impossible to say
Context:
It was impossible to help laughing at the funny conflict between Laurie 's chivalrous reluctance to speak ill of womankind , and his very natural dislike of the unfeminine folly of which fashionable society showed him many samples .<br>Jo knew that ` young Laurence ' was regarded as a most eligible parti by worldly mamas , was much smiled upon by their daughters , and flattered enough by ladies of all ages to make a coxcomb of him , so she watched him rather jealously , fearing he would be spoiled , and rejoiced more than she confessed to find that he still believed in modest girls .
Hypothesis: Impossible is a figure of speech here.  It is definitely possible to not laugh at the conflict.
It's impossible to say
Context:
The Oldman River is a river in southern Alberta, Canada. It flows roughly west to east from the Rocky Mountains, through the communities of Fort Macleod, Lethbridge, and on to Grassy Lake, where it joins with the Bow River to form the South Saskatchewan River, which eventually drains into the Hudson Bay.
Hypothesis: The Oldman River passes through Fort Macleod

Yes