问题描述：
1.How soon should the windows ______(clean).
2.Millie ______(know) nothing about the accident until she _____(tell) by me.
3.—what ______you ______(say) to me?I'm sorry I______(not watch) your words.
—I _____(say) something _______(must do) to protect the environment.
2.Millie ______(know) nothing about the accident until she _____(tell) by me.
3.—what ______you ______(say) to me?I'm sorry I______(not watch) your words.
—I _____(say) something _______(must do) to protect the environment.
问题解答：
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