Open workbooks with variables in filename using loop

[as1234]

I am trying to open several workbooks with variable names using a loop. All of the filenames are of the form "variable GSC 2011_04.xlsx"

My code is below, with the problem area highlighted.

Dim p1, p2, p3, p4
p1 = "apples01"
p2 = "bananas2"
p3 = "cat01"
p4 = "dog01"

Dim MyPath
MyPath = "C:\Users\me\Documents\folder"
ChDir MyPath

Dim x
For x = 1 to 4
Workbooks.Open (px & " GSC 2011_04.xlsx")
Next x

Thanks!