1. But for mobile phone, ________________ （我们的通信就不可能如此迅速和方便）。
　　2. In handling an embarrassing situation, _______________ （没有什么比幽默感更有帮助的了）。
　　3. The Foreign Minster said he was resigning, _______________ （但他拒绝进一步解释这样做的原因）。
　　4. Human behavior is mostly a product of learning, __________________ （而动物的行为主要依靠本能）。
　　5. The witness was told that under no circumstances ________________ （他都不应该对法庭说谎）。

　　答案与解析：
　　1.our communication would not have been so efficient and convenient
　　2.nothing is more helpful than humor/ a sense of humor
　　3.but he refused to make further explanation
　　4.while animal behavior depends mainly upon (或on) their instinct(s)
　　5.should he lie to the court / is he allowed to lie to the court