4. (A) lesson　 (B) advice　 (C) instruction　 (D) rule

3. (A) true　　 (B) enough　 (C) effective　　 (D) difficult

2. (A) likely　 (B) rarely　 (C) generally　　 (D) luckily

1. (A) work　　 (B) life　　 (C) body　　　 (D) idea

80. You can't imagine that rats eat 40 to 50 times __________.

A. in weight　　　　　 B. by weight　　　　　 C. of weight　　　　　 D. their weight

79. The students came into the classroom __________.

A. in one's and two's　　 B. in one and two　 C. in ones and twos　　　 D. ones and twos

78. The number of people invited______fifty, but a number of them_________absent for different reasons.　

A. were ;was　　　　 B. was ;was　　　 C. was ;were　　　 D. were ;were

77.The river is _____________　.

　 A. wide fifty-five meter　　　　　　　　　　　　　　　 　B. fifty-five meters wide

　 C. wide fifty-five meters　　　　　　　　　　　　　　　　　D. fifty-five meter wide

76.The Olympic Games are held __________.

A.　every four years　　　 B. every four year　　 C. every fourth years　 D. every four-years

75. He came out_________ in the final examination . 　 A. first 　　　　　　　　　　 B. one 　 　　　　　　　　 C. the first　　 　　　　　 D. the one