21.The Attorney General ordered a federal autopsy of Brown’s body, seeking to（ ）the family and community there would be a thorough investigation into his death.

59.The teacher（ ）expects his students to pass the university entrance examination.

58.There has been a（ ）lack of communication between the union and the management.

57.The party’ s reduced vote was（ ）of lack of support for its policies.

56.The multinational corporation was making a take-over（ ）for a property company.

55.The head of the Museum was（ ）and let us actually examine the ancient manuscripts.

54.The popularity of the film shows that the reviewers’ fears were completely（ ）.

53.I arrived at the airport so late that I（ ）missed the plane.

52.The police have offered a large（ ）for information leading to the robber’s arrest.

51.——“What courses are you going to do next semester?”——“I don’t know. But it’s about time（ ）on something.”

50.（ ）for the fact that she broke her leg, she might have passed the exam.