72. They are looking t　　　　 　books to find some useful information.

71. The bus runs s　　　　 　and I’m afraid I’ll be late.

70. The price is l　　　　　 　and I can buy it.

69. He lives in the tenth floor, so he takes the e　　　　 　up and down.

68. We buy books from the b　　　　　 .

67. When we leave school, we say g　　　　 　to each other.

66. We usually have lunch at n　　　　 .

65. Yao Ming is an e　　　　　 　basketball player.

64. There are four s　　　　 　in a year.

63. The p　　　　　 　of China is about 1.3 billion.