The answers are given in order by puzzle number.
If I have made any mistakes, please let me know. 
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1. The left set has complete pairs of numbers that add up to 10. 
5. The left side has lines coming from the 4 corners of each of the six squares. The right side has 
lines coming from the approximate center of each side of the six squares.
14. The numbers in the set on the left add up to 27. 
17.  The lines between the boxes in the set on the left connect. (A line in a box that touches 
the edge of the box, crosses the line and continues into the next box.)