Ответ:
1. You / take
Were you taking photos at 10 a.m.?
2. Your friend / be busy
Was your friend busy on Saturday / 8 a.m.?
3. You and your friends / have
Were you and your friends having an English lesson?
Were you taking photos at 10 a.m.?
Was your friend busy on Saturday / 8 a.m.?
Were you and your friends having an English lesson?