Typically, the vowels at the end show what is masculine or feminine. Like Cesar said, words that end in 'a' are generally female, and words ending in 'o' are generally male. (In their singular form, anyway.) But there are certain cases, like 'pane' where it isn't either 'a' or 'o', and the article 'il' tells us it's masculine. (At least, this is what I've gathered.)
Does anyone else feel the audio for these are spoken way to fast? I like to repeat the audio to practice my pronunciation, but I sometimes feel they speak way to quickly. Maybe if they had the turtle function so it can be broken down into bite sized bits as well as the natural speed of a native to practice listening?