英语填空题 （介词或副词）
2.We were glad that his speech had made so deep an impression_____his listeners.
3.Their marketing plan is based_____a study of customer needs.
4.He is viewed as a strong candidate_____the job
6.Her classmates are very smart and she'll have to be_____her best to keep up with them.
7.In some cases,people treat their pets (宠物) _____members of their families,or perhaps better.