Emergencies and unexpected situations happen all the time.

They urged that measures _______ immediately to protect the endangered animals.

Jack is late again. It is ______ of him to keep others waiting.[ ]

er,in recent years, ___Three Gorges have come to be appreciated more for theirnatural beauty as ___ wonder of Nature．

China’s Olympic gold medal-winning hurdler Liu Xiang announced his retirement on Tuesday. Do you still remember ________