2.It is the duty of servicemen to shield their country from invasion.
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3.The safety of those students caught up in the demonstration must be guaranteed.
4Hearing that---------(我的心情非常沉重,一个字也说不出来)
5.Don’t expect a so called ideal life with only happiness because nobody’s life_______(没有一点痛苦和悲哀)
6.Libraries should _________(实现提供资讯,启发读者的功能)