If you want to adjust height of all rows to fit text in cell, you can do following. This will save your one by one height adjustment for each row.
Select the rows for which you want to adjust height.
In Microsoft Office Excel 2003 & earlier versions of Excel, point to Row on the Format menu, and then click AutoFit.
In Microsoft Office Excel 2007, click on the Home tab, click on Format in the Cells group, and then click AutoFit Row Height.