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other natural changes. 答案: or; but; when 8. All scientists subscribe ________the view that it is human activity ________ has caused this global warming. 答案: to; that 9. She made a mitment ________ she would study harder, ________ made her mother really happy. 答案: that; which 10. Try your best from now on ________ you may have a chance to catch up with your classmates. 答案: and