定语从句 用 介词+whom/which 填空

定语从句 用 介词+whom/which 填空
1 The ship,____the Europeans sailed to the American continent,was called the Mayflower.
2 Little Peter had a dream____he was taken to the amusement park.
3 He spent a wonderful summer,____ he joined us in the camping trip.
4 Alec asked the policeman___ he worked to contact him whenever there was an accident.
5 The doctor____he sent his son is very famous.
6 His glasses,___ he could do nothing,fell to the ground.