решите задание по английскому......

1. What had he visited by that time?
2. What time had she shown us the central part of the city by?
3. Had she bought all the things for dinner by 12 o'clock?
4. Had they seen most of the Winter Palace in Leningrad by that time?
5. What time did the collective farmer gather all the harvest by?
6. Who had prepared breakfast by 8 o'clock?

What he had visited?
By what time she showed us the central part of the city?
Had she bought all for dinner by 12 o'clock?
Had by that time they had seen?   насчет этого я не уверена
By what time the collective farmers gatheredall the harvest?
Who by 8 o'clock prepared breakfast?