76. The teacher told the students to stay in the classroom and they did ( ).

65. It is absolutely essential that William( ) his study in spite of some learning difficulties.

64.( )at in his way, the situation doesn’t seem so desperate.

63. It is not uncommon for there ( )problems of communication between the old and the young.

62. Overpopulation poses a terrible threat to the human race. Yet it is probably ( )a threat to the human race than environmental destruction.

61. The research requires more money than ( ).

60. He would have finished his college education, but he ( )to quit and find a job to support his family.

59. The student said there were a few points in the essay he ( )impossible to comprehend.

58. The committee has anticipated the problems that ( )in the road construction project.

57. It is not ( )much the language as the background that makes the book difficult to understand.

56. She ( )fifty or so when I first met her at the conference.