Відповідь:
1) The building was empty, wasn't it?
2) Does Mr Sprice stood at the window of the office?
3) Where had he arrived before nine o'clock
4) Does he had made two telephone calls, or just one?
5) Does somebody answered?
6) What had he opened then?
7) By 10 o'clock, he had distated replies to nearly all the leters, isn't he?
8) When he had started to make telephone calls again?
9) Was he sure the Acting Maneger had noticed that, or not?
10) Who had see he by 4 o'clock?
11) He had asked them for an explanation, isn't he?
12) When he must take more telephone calls?
13) By 3 o'clock, he had found two mistakes, or three?
14) Does he must try again to speak to the Acting Assistant Maneger?
15) He didn't pick up his umbrella, is he?
Я не уверена по по поводу правильного времени в вопросах, но вообщем как то так
