40. They name the factory after Alexamder Bell, _________________________________(他被认为发明了) the first telephone. (consider)

39. This is the very person from ________________________ (我从他那了解) about the news. (learn)

38. Mary, come here------everybody else, ________________________(呆在原地). (where)

37. The scientist stayed in Africa studying animals for 13 years. She ____________________(一定经历了) a lot of difficulties. (go)