Пожалуйста помогите.
Поставьте вопросы к предложениям, начиная их словами, данными в скобках:
1. Yesterday I went to London to see a friend of mine (When? Why?).
2. Last winter he often worked in the library (Where?).
3. The manager entered the office, sat down at his desk and began to look through the morning mail (Who?).
4. When I arrived at the station, I went to the booking-office and bought a ticket (Where?).
5. He called when I was at the University (When?). ​