Final answer:
Listening to a podcast is the most suitable activity for ELL students to learn conversational vocabulary, as it immerses them in natural speech and allows for interactive learning.
Step-by-step explanation:
The most appropriate activity for ELL students learning conversational vocabulary is listening to a podcast. Podcasts often feature natural spoken language and discussions on a variety of topics, which can help ELL students to understand the flow of conversations, pick up new phrases, and improve their listening skills in a more engaging way than traditional textbooks methods. Unlike reading a newspaper article or writing a research paper, listening to podcasts provides immediate exposure to conversational speech. Solving math problems would not be suitable because it does not involve language learning. While engaging in podcasts, students can pause, rewind, and listen to sections repeatedly, which is beneficial for language acquisition. In addition, teachers can choose podcasts that match the students’ interests, making the learning process enjoyable and personalized.