Answer:
"El día" (the day) - Even though "día" ends in -a, it's masculine.
"La noche" (the night) - Conversely, "noche" ends in -e but is feminine.
"El sol" (the sun) - "Sol" is masculine, despite its ending in -l.
"La luna" (the moon) - "Luna" is feminine, despite its ending in -a.
"El agua" (the water) - "Agua" is masculine, despite ending in -a.