1.Looked to us for a solution.
2.To supply an explanatory key for.
3.A set of answers to a test.
4.Many questions remain unanswered.
5.A solution, as to a problem.
6.The best solution; the best time for planting.
7.This problem will not work out.
8.give the correct answer or solution to.
9.Mary tried with all her might and main to solve the problem.
10.Beat about for days in search of an answer to the problem