Put a question to each sentence
1) She had shown us the central part of the city by 5 o'clock.(By what time)
2) She had bought all the things for dinner by 12 o'clock. (Наd)
3) By that time they had seen most of the Tower of London. (Had)
4) By Saturday Martin had seen all the most popular places of interest in London. (By what time)
5) By 8 o'clock the daughter had prepared breakfast. (Who)

By what time had she shown us the central part of the city? Наd she bought all the things for dinner by 12 o'clock? Наd they seen most of the Tower of London by that time? By what time had Martin seen all the most popular places of interest in London? Who had prepared breakfast by 8 o'clock?