回答

11
①A lot of people seemed to have seen the movie. 
②It seemed that a lot of people had seen the movie.
12
①My grandfather is said to have been a famous athlete when he was young. 
②It is said that my grandfather was a famous athlete when he was young.
13
①Mike seemed to have been interested in classical music. 
②It seemed that Mike had been interested in classical music.
14
①It is difficult to answer the question. 
②The question is difficult to answer.
15
①It is easy for beginners to understand this book. 
②This book is easy for beginners to understand.

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