If you put your mouse's cursor over the Arabic words that have dashes under them in the exercises, you'll see the definitions. I haven't yet gotten the requirement to translate Arabic words into English without first having seen the words. If you do, it's not a big problem. You get the question wrong the first time, you then see the correction, you make note of the correct answer, and go on from there. That's how Duolingo does it. Don't give up, though.