Start your class with a striking image (Pixabay is a good source for free, high-quality, public domain photos) and ask them to take time to generate at least three questions about the image. Students share their questions, thus guiding the introduction to a new topic. Good teachers always use a "hook", but an image can often provoke many different kinds of curiosity for a diverse group of learners. The questions will vary greatly and that's for the better.
Example Topic: Victory Day / Russia
Write three questions about this topic: (examples)
1. Is the girl happy or sad?
2. What is that symbol in the upper left-hand corner?
3. Why is she wearing a hat?
It's even better to give students a list of topics that are likely unknown to them. Have them do a Google image search for a picture related to the topic and put their favorite image into a shared presentation. Students have to add three questions to their topic and try to answer questions on another student's topic.