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Look at the first row. As we noted before, this row will have a single block with single cell. Now we know where it will be. It must be in the sixth column and all the other cells in this row will be white.
The shortcut to clear the remaining gray cells in a row is to shift-click in the row's number area. Note that the "1" is now bold.
Now look at the second row. This row has a single block of two cells. We know that one of the cells is in the sixth column, but we don't yet know if the other cell is in the fifth or seventh column.
What we do know is that the cells in the first four and last three columns must be white. The shortcut to making them all white is to shift-click in each of these cells.
Look at the sixth row. This row is made up of two blocks of four cells with at least one white cell between the two blocks. (If there were no white cell between them, they would be one block of eight cells.)
There is only one way that two blocks of four cells will fit into a row of ten cells when the sixth cell is blackened.