MS Excel
If you begin typing an entry into a cell and then realize that you don't want your entry placed into a cell, you:

Press the Erase key
Press the Edit Formula button
Press Esc
Press the Enter button

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MS Excel
You can select a single range of cells by

Pressing the Ctrl key while dragging over the desired cells
Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells
Dragging over the desired cells
Pressing the Shift key and an arrow key

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