02554农业政策与法规:come up with , come up against , come up to , come up for 是做何解？

come up with come up with , come up against , come up to , come up for 是做何解？ You will come up with the right answer. come up什么意思？ come away with me come～～～～～～～～ come everybody sing with me They are trying to come up with a solution to problem.为什么solution 用to ? come come come come!!!!!!!