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3. Jim is the boy( ______ hat is red. ) 4. He gave me a pen( ___________ he bought last week. ) 5. Mary has read all the books (_________ I lent her. ) who/that whom whose that/which that 定語(yǔ)從句 6. Is it the reason (_____ you were late? ) 7. October 1st is the date (_____ China celebrates its National Day. ) 8. We walked in a garden( _____ many trees and flowers had been planted. ) 9. This is the island (_____ I lived for two years. ) 10. 20212021 are the years( _____ I studied in the university. ) why when where where when 定語(yǔ)從句