Ответ:
1. Does Mary usually go to the college on foot?
Mary usually goes to the college on foot, doesn't she?
2.Were my relatives in Moscow last year?
Last year my relatives were in Moscow, weren't they?
3. Will the students visit our local museum soon?
The students will visit our local museum soon, won't they?
They were having a party when the doorbell rang. Peter opened the door and an angry policeman entered the room. Mary and George were dancing while the music was playing loud. Bob and Ben were drinking Coke while Kristi was eating sandwiches. Ted and Steve sang. Alex was cleaning while dog was barking. James was sleeping on the sofa while Sheila was trying wake him up. Edward and Lucy laughed. Susan brought the coffee. Chris left the party while Paula was crying because not wanted him to leave.