  To address the issues of superconducting and charge properties in high-T$_c$
cuprates, we perform a quantum Monte Carlo study of an extended three-band
Emery model, which explicitly includes attractive interaction $V_{OO}$ between
oxygen orbitals. In the physically relevant parameter range, we find that
$V_{OO}$ acts to strongly enhance the long-range part of d-wave pairing
correlation, with a clear tendency to form long-range superconducting order in
the thermodynamic limit. Simultaneously, increasing $|V_{OO}|$ renders a rapid
increase of the nematic charge structure factor at most of wavevectors,
especially near $\textbf{q}=(0,0)$, indicating a dramatic enhancement of
nematicity and charge density waves. Our findings suggest that the attraction
between oxygen orbitals in high-T$_c$ cuprates is a common thread linking their
superconducting and charge properties.
