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用所给词的适当形式填空。 1. His mother _____(kill) in an accident last month. 2. Do you need _____ (travel) and make new friends? 3. Her mother asked her _____ (help) do the cleaning. 4. The scientist goes to the fields _____ (two) a day. 5. China now produces enough rice _____ (feed) her people every year.