5. As he is a warm-hearted man,he is always ready to help others. 

         warm-hearted man,he is always ready to help others.

4. I came back because it was raining.

I came back               the rain.

3. As a young man,he was fond of reading.

               a young man,he was fond of reading.

2. No sooner had we arrived at the station than the bus left. 

         arrived at the station when the bus left.

句型转换

1. The moment I heard the voice,I knew my mother was coming.

       I heard the voice,1 knew my mother was coming.

9. The lamp went out,       (因为) there was no oil.

8.          (既然) you have mentioned it,I will tell you the truth.

7. He was absent from the meeting        (因为) he suddenly fell ill.

6.          (既然) you’re not interested，I won’t tell you about it.

5.        (因为) you are my good friend,I will tell you the secret.