想练习英语口语总是感到没有话说怎么办？

Others have excellent suggestions. Let me add that for now, you can imagine you're giving a presentation in your native language, Chinese, and on the fly, translating that into English. Many language teachers oppose this way of learning (you do translation in your brain). But I disagree. Once you're fluent in English, the explicit translation in your brain silently yields to "natively" thinking in English.