68. __________

67. __________

75. While mother was cooking in the k　　　　　　　　　　　　　 , I helped her wash vegetables.

74. Forty-five p _________ of the students in the class are boys.

73. The main p _____ of this lesson is to teach how electricity works.

72. It's too hot standing in the sun. Let's have a seat in the s _________.

71. She was born in a small town in Liaoning P ________.

70. Jane and Betty are going on _________(各自的) holidays in a few days.

69. The rooms in Golden Flower are ________ (昂贵的) for me to live in.