Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to use excel 2007 [title] Become familiar with general microsoft office 2007 features. [step] Learn how to save and open files, use the help features, print and do other common office tasks before learning more about how to use excel 2007. [title] Click on a cell with the left mouse button.

Ending1: [step] On a computer, a file containing a excel toolbar is either selected, or selected by the cursor. Click on the file and a window will pop up asking for your help. Ending2: [step] This is the first cell in the list. [title] Click on excel 2007's business menu (with the right mouse button). Ending3: [step] Enter desired text or numbers into the cell. Click another cell or press enter to finish. Ending4: [step] Many phones have an arrow button on it as you type to mark the cell. [title] Choose a cell model to use for a brief background background.

Answer format: ending1/ending2/ending3/ending4