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四维热练 (1)用surround的适当形式填空 ① Surrounded (surround) by his students,Mr Li told an adventurous story. ② Surrounding (surround) their teacher,the students asked a lot of questions about how to learn English well. ③The surrounding (surround) villages have been absorbed by the growing city. ④Some insects take on the color of their surroundings (surround) to protect themselves.