Select all the species in which the central atom is $s{p}^2$ hybridised and carries a lone pair.

$\mathrm{SO}{}_2$ and $\mathrm{NO}{}_2{}^{-}$ each have two bonds and one lone pair on the central atom, giving three domains ($s{p}^2$). $\mathrm{NH}{}_3$ has a lone pair but four domains ($s{p}^3$), and $\mathrm{BF}{}_3$ is $s{p}^2$ but has no lone pair.