69. Don’t t______________ the waste paper everywhere.

68. Earthquake! Can you feel the earth s_______________ now?

67. When the teacher came in, we were ______________ (讨论) the project.

66. F____________ air is good for your health.

65. Last _______________ (世纪), many people died from illness.

64. His ______________ (到达) makes me happy.

63. Different people have different _______________ (业余爱好).

62. If someone does not show good manners to others, he is 　　　(没礼貌的).

A、根据句意，汉语提示或首字母写出单词。(计10分)

61. Swallow fly to 　　　　　　(北方的)countries in summer .