U6-U8语法复习题Class _Name_I. Choose the best answer. (选择最恰当的答案)1. _ human beings _ and animals can live without air.A. Both . and B. Neither . norC. Either . orD. Not only . but also2. Its hard to keep the house _ with three boys.A. cleaningB. to cleanC. cleanedD. clean3. There is going to _ a school sports meeting next month.A. haveB. hasC. beD. being4. Ben and Kitty usually leave