According to the Zero Power Rule of Integer Exponents, any non-zero number raised to the power of zero equals 1. Therefore, we have:
\[ 1^0 = 1 \]
Now, substituting this back into the expression we have:
\[ 4/3 \cdot (-2 + 1^0) = 4/3 \cdot (-2 + 1) \]
We can fill in the blank in the equivalent expression:
\[ 4/3 \cdot (-2 + ?) = 4/3 \cdot (-2 + 1) \]
Thus, the blank should be filled with \(1\). So, the answer is:
1