Research suggests that for students, especially those in grades three and up, the activity which leads to the greatest growth in vocabulary is:

Question

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Research shows that reading is the most effective way to expand one's vocabulary, especially for students in grades three and up. Through reading, students encounter new words in context and can develop a deeper understanding and appreciation of language. While conversations and writing can also contribute to vocabulary growth, they are not as effective as reading.

Research Suggests That for Students, Especially Those in Grades Three