69. It normally takes a semester for a college freshman to adjust to his college life.

67. You needn’t go there anymore. He already knows about it.

51. The students are encouraged to do more listening, reading and writing by their teacher.

37. He was very happy to hear from his old friend.

5.Life is meaningless without a purpose.

16. I slept soundly all night.

64. Transistors are small in size and light in weight.

60. All that glitters is not gold.

52. There is a large amount of energy wasted due to friction(摩擦).

45. The traffic jams during morning and afternoon rush hours are a headache in big cities now.