macro that will paste multiple selections in one row

Hi,
I'm trying to create a macro that will copy and then paste a range of cells to another worksheet but in one row. The cells that I would like to copy are in 3 different rows. They are B7:F7, C12:D12, C17:E17. Now I've managed to find a macro through this forum that will paste the particular cells but they I can't seem to find a way to record a macro that will paste them in one row. In addition to that I also tried copying and pasting each of the ranges of cells individually it kind of worked but it came up with an error box.
The problem is, even if I can find a macro to paste those cells it has to be able to paste them underneath the previous row. So e.g it should paste the cells in row 17 and then when i press the command button again it should paste them to row 18.

Thanks a lot in advance