Which of the reactions listed would proceed in the direction shown, under standard conditions, in the presence of the

appropriate enzymes?

Malate $+$ pyruvate longrightarrow oxaloacetate $+$ lactate

Acetoacetate $+$NADH$+H^{+}$longrightarrow$-$hydroxybutyrate $+NA{D}^{+}$

Pyruvate $+-$hydroxybutyrate longrightarrow lactate $+$ acetoacetate

Malate $+$NAD$+$longrightarrow oxaloacetate $+$NADH$+H^{+}$

Pyruvate $+$NADH$+H^{+}$longrightarrow lactate $+NA{D}^{+}$

Acetaldehyde $+$ succinate longrightarrow ethanol $+$ fumerate