Вставьте частицу to перед глаголом, где это требуется. It is not an easy thing ... learn a foreign language. We have ... practice very hard and try ... learn as many words as possible. We can't ... speak any language without words. What do you ... think is the best way ... memorizes new words? First of all, you should ... repeat the words you've learnt as often as possible. Secondly, you ought ... listen to the material you are learning, because words are not always pronounced according to the rules of reading. And finally, it's a good idea ... study words before you go to bed.