84. ---Where is Mother

---She is in the kitchen. She _____the housework all morning.

A. is doing B. was doing C. has done D. has been doing

83. The problem was that it is ____valuable ___everyday use.

A. too; to B. too; for C. too; of D. so; that

82. But later people developed a way of printing, _____rocks.

A. used B. using C. and use D. uses

81. ____Mr Brown's anger, it was his own son who didn't agree ____him.

A. To; with B. Because of; to C. With; of D. For; on

80. When he saw all his books _____ here and there on the floor, he knew that something terrible _____.

A. lying; must have happened B. lie; must happen

C. lay; might have happened D. had lain; could have happen

79. The driver drove __ hit a big tree and the car came to a stop.

A. too carelessly to B. carelessly enough to C. so carelessly that he D. so careless that he

78. The man went into the room, _____ rather strange.

A. to look B. looking C. looked D. and looking

77. But she had to ___ the company and ____a man in order to get a job.

A. lie to; pretended to be B. lie; pretended to be C. lie to; pretended being D. lie; pretended as

76. I _____ her voice at once on the phone, though we hadn't seen each other for ten years.

A. heard B. knew C. realized D. recognized

75. We have been _____ by all our friends since we settled in the new house.

A. called on B. called at C. called into D. called for