摘要： A robot is a machine can do some difficult work instead of man. A. who B. it C. that D. what 29. I met Mr Green I was walking across the bridge, but I didn't say hello to him. A. before B. after C. until D. while 30. --- Can you guess if the boy earrings for his mother as a present? --- I think he'll buy a pair if he money. A. buy, has B. will buy, will have C. will buy, has D. buy, will have

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