别让孩子靠近,这里危险!____ the children _____.It's dangerous here!
别让孩子靠近,这里危险!____ the children _____.It's dangerous here!
那个老人得带上眼镜才能看得清东西.The old man has to wear a pair of glasses so that he can __ ___ __.
保持环境清洁很重要.__ ___ important to ___ the environment
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