  We show that in the PQCD approach the $B\to \rho(\omega) K$ decays display
not only the dynamical penguin enhancement, the mechanism responsible for the
large branching ratios (BRs) of $B\to \phi K$ decays, but also the importance
of annihilation contributions. We find that the CP asymmetries (CPAs) of $B\to
\rho^{\pm}K^{\mp}$, $B^{\mp}\to \rho^0(\omega)K^{\mp}$ (class I) are all over
50%.
