As usual, replenish vocabulary of foreign words? Usually use small cards with foreign words and translations. They take out one card from a pack of cards and try to remember the translation. Then another card. This is very boring.
At the same time, all of you know what crossword is. This is a simple logical task. Or not a very simple logical task. But when many words have already been written in the crossword, everything becomes likeOFLAMERON cards. It is necessary to enter several missing letters and you will make a foreign word.
Picture for the German language. But there are such cards for many European languages. Here is one of the lists of links to ready-made cards.
Here you can download hundreds of ready-made cards, print cards and learn foreign languages.