答案：Without/But for your help, I would have failed.

　　2. If I were a teacher, I would have lots of students.(转换为省略句)

　　→_____________________________________________________

　　答案：Were I a teacher, I would have lots of students.

　　3. If we should visit Zhejiang University tomorrow, I would play basketball there.(转换为省略句)

　　→_____________________________________________________

　　答案：Should we visit Zhejiang University tomorrow, I would play basketball there.

　　4. If I had entered Rui'an High School, I would not sit here now.(转换为省略句)

　　→_____________________________________________________

　　答案：Had I entered Rui'an High School, I would not sit here now.

　　5. Without sunlight or water, all the living things on the earth would die.(转换为if条件句)

　　→_____________________________________________________

　　答案：If there were not sunlight or water, all the living things on the earth would die.

　　Ⅳ.单句语法填空(不多于3个单词)

　　1. The new law states that people ________ drive after drinking alcohol.

　　答案：mustn't　句意：新的法律规定，禁止酒后开车。"mustn't"不准。

2. It ________ have been her to leave her child alone. She isn't