  Using the entire data sample of $980\mathrm{~fb}^{-1}$ collected with the
Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we present
measurements of the branching fractions of the Cabibbo-favored decays $\Xi_c^0
\to \Lambda K_S^0$, $\Xi_c^0 \to \Sigma^0 K_S^0$, and $\Xi_c^0 \to \Sigma^+
K^-$. Taking the decay $\Xi_c^0 \to \Xi^- \pip$ as the normalization mode, we
measure the branching fraction ratio ${\cal B}(\Xi_c^0 \to \Lambda K_S^0)/{\cal
B}(\Xi_c^0 \to \Xi^- \pi^+) = 0.229\pm0.008\pm0.012$ with improved precision,
and measure the branching fraction ratios ${\cal B}(\Xi_c^0 \to \Sigma^0
K_S^0)/{\cal B}(\Xi_c^0 \to \Xi^- \pi^+) = 0.038\pm0.006\pm0.004$ and ${\cal
B}(\Xi_c^0 \to \Sigma^+ K^-)/{\cal B}(\Xi_c^0 \to \Xi^- \pi^+) =
0.123\pm0.007\pm0.010$ for the first time. Taking into account the branching
fraction of the normalization mode, the absolute branching fractions are
determined to be ${\cal B}(\Xi_c^0 \to \Lambda K_S^0) =
(3.27\pm0.11\pm0.17\pm0.73) \times 10^{-3}$, ${\cal B}(\Xi_c^0 \to \Sigma^0
K_S^0) = (0.54\pm 0.09\pm 0.06\pm 0.12) \times 10^{-3}$, and ${\cal B}(\Xi_c^0
\to \Sigma^+ K^-) = (1.76\pm 0.10\pm0.14\pm 0.39) \times 10^{-3}$. The first
and second uncertainties above are statistical and systematic, respectively,
while the third ones arise from the uncertainty of the branching fraction of
$\Xi_c^0 \to \Xi^- \pi^+$.
