The most natural way to do listening activities in a comprehension-based class is simply by students listening to stories. A story-listening lesson should not include dictation exercises, should not be accompanied with fill-in-the-blanks, or match-the–short-dialogs-and-the-pictures exercises. It's the story that counts.
Story listening is used for aural comprehensible input in the comprehension-based program. It is especially helpful for reluctant readers. Listening to stories increases interest in book reading, in addition to providing the linguistic competence needed for book reading. For example, a number of studies show that listening to stories builds vocabulary.
All you have to do is to tell an interesting story every day or every week to your students, and their fluency and accuracy in writing will improve. When they understand and have fun listening to stories in English, they cannot help but get better in English.