861. If you don"t work, you will fail to pass the exam.如果你不学习，你考试就会不及格。

860. If I were you, I would not be bothered by English.如果我是你，就不会为英语烦恼了。

859. I received an invitation, but I did not accept it.我收到-份请帖，但没有接受。

858. I"ll still love her even if she doesn"t love me.即使她不爱我，我还仍然爱她。

857. If Tom cannot keep his promise, he"ll lose face.如果汤姆不能信守诺言，他就会丢面子。

856. I cannot express how glad I am to hear from him.我无法表达我接到他的信时有多高兴。

855. How would you go to Beijing, by air or by train?你怎样去北京，是乘飞机还是坐火车?

854. His vanity was hurt by their talking so frankly.他们坦率的谈话伤害了他的虚荣心。

853. He usually drops in at my place on his way home.他常常在回家的路上顺便来看看我。

852. Would you please go to a dancing party with me?请你跟我一起去参加一个舞会好吗?