You can't do this with the legacy dropdown control. You can do it with an ActiveX combo box, and if your choices are 256 characters or less you can do it with a dropdown content control.
If you can stay within the 256-character limit, and if users all have Word 2007 or later (currently Windows only, not Word for Mac), then the content control is the preferable solution because it will display the entire choice in place.
If that's not possible, the ActiveX combo box *may* work for you. First, I'm not sure ActiveX is supported in Word for Mac; someone else will have to weigh in on that. Second, the combo box requires macro code to operate, so it will run into security issues
on some computers. Third, the combo box itself will display only one line for each choice (it has to scroll sideways to read the whole thing), and the code will have to transfer the complete text of the choice to some location in the document outside the combo
box.
The code will look something like this:
Private Sub ComboBox1_Change()
ActiveDocument.Range.InsertAfter ComboBox1.Value & vbCr
End Sub
Private Sub Document_New()
Combo_Initialize
End Sub
Private Sub Document_Open()
Combo_Initialize
End Sub
Private Sub Combo_Initialize()
With ComboBox1
.AddItem "Four score and seven years ago our fathers brought forth " & _
"on this continent a new nation, conceived in Liberty, and " & _
"dedicated to the proposition that all men are created equal. "
.AddItem "But, in a larger sense, we can not dedicate...we can not " & _
"consecrate...we can not hallow this ground. The brave men, " & _
"living and dead, who struggled here, have consecrated it, far " & _
"above our poor power to add or detract. The world will little " & _
"note, nor long remember what we say here, but it can never " & _
"forget what they did here. It is for us the living, rather, to " & _
"be dedicated here to the unfinished work which they who fought " & _
"here have thus far so nobly advanced. It is rather for us to " & _
"be here dedicated to the great task remaining before us-that " & _
"from these honored dead we take increased devotion to that " & _
"cause for which they gave the last full measure of devotion-" & _
"that we here highly resolve that these dead shall not have " & _
"died in vain-that this nation, under God, shall have a new " & _
"birth of freedom-and that government: of the people, by the " & _
"people, for the people, shall not perish from the earth."
End With
End Sub