1. Key: 第七讲：1.c 2.A 3.B 4.B 5.A 6.c 7.B 8.A 9.C 10.B
第八讲
She said that John had left for Shanghai two days before.
Mary told me that she would go and see her Chinese teacher the next day.
He asked us to sit down.
The teacher told Frank not to be late again.
Tom said that he was listening to the radio.

2. Key:
Jane asked me whether (if) I studied English then.
Mary asked Bob if he was learning Chinese at Nanjing University then.
Ann asked Mary where she had found her course book.
Li Ming asked me if I had my lunch.
Tom asked me whether I had lived in Beijing or in Shanghai three years before.