Based on your search query, I would recommend Twee as it has a feature specifically designed for vocabulary building. This feature allows you to generate vocabulary lists related to the topic you're teaching and design fill-in-the-gap and open-the-brackets exercises. This could be particularly useful for grabbing vocabulary from articles, as you can create a list of words from the article and then use the exercises to help students understand and remember these words.

In addition, Twee also offers a dialogue and story generator feature. This could be used to create dialogues or stories using the vocabulary from the articles, providing students with context and helping them understand how to use the words in sentences.

Furthermore, Twee is praised for its time-saving capabilities and student-first approach to lesson planning, which could be beneficial for you as a teacher. It currently offers free early access beta, making it a cost-effective solution for your needs.