89. You’d better finish your homework without r____________(参考) to your notes.

88.Our school is trying its best to improve our studying and working c____________.(环境)

87. Our school is s____________ (包围)by many trees.

86. His b_______(行为)is worthy of great praise.

85. At the same time they are taking strong m______(措施)to protect wildlife resources.

84. We were all e_______ (娱乐)by his humorous stories.

83. He took a m　　　　　 (一口)of fresh air.

82. If you go e__________,(向东) you’ll find the sea.

81. I’m not at all s________(满意的)with the present situation.