Many boys enjoy _______ football, basketball or baseball

－ What does the sign over there read － “No person ________ smoke or carry a lighted cigarette, cigar or pipe in this area”

Which do you think is ________, health or wealth？

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

Either he or I ______to the airport.

下面哪一种不是网络管理协议?______。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

Hurry up, or you ______ catch the train.

关于如何有效解释两次世界大战的起源和暴行产生的机制，战争史家一直感到__________。他们发现，当落实到细节研究上时，常常__________迭出。譬如马克思主义史家认为经济压力是大战的动因，但历史事实却是二战爆发在欧洲的经济上扬期，因此许多战争史家不得不有此共识：战争起源问题并非历史学专业所能解释。　　依次填入划横线部分最恰当的一项是：

以下哪一项不是药典中记载的内容________。

以下哪一项不是分组密码的优点?______。