  Let $K$ be an algebraically closed field of characteristic zero, $\delta$ a
nonzero $\mathcal{E}$-derivation of $K[x]$. We first prove that
$\operatorname{Im}\delta$ is a Mathieu-Zhao space of $K[x]$ in some cases. Then
we prove that LFED Conjecture is true for all $\delta=I-\phi$, where $\phi$ is
an affine polynomial homomorphism of $K[x_1,x_2]$. Finally, we prove that LFED
Conjecture is true for some $\delta$ of $K[x_1,x_2,x_3]$.
