MS Excel
You can merge the main document with data source in Excel. In mail merge operation, Word is usually

None of these
Source
Client
Server

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MS Excel
You can select a single range of cells by

Dragging over the desired cells
Pressing the Ctrl key while dragging over the desired cells
Pressing the Shift key and an arrow key
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

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