1. By the time we get to Chicago this evening, we _____________(drive) more than four hundred miles. We are going to be exhausted.

今天晚上到达芝加哥之前，我们已经连续开了400里，都要崩溃了。

2. When Sarah goes on vacation next month, she _____________(study) German for over two years. She should be able to communicate fairly well while she is in Austria.

当莎拉下个月去度假的时候，她已经学习了两年德语了。她到澳大利亚的时候应该感觉相当好。

3. I have not traveled much yet; however, I _____________(visit) the Grand Canyon and San Francisco by the time I leave the United States. 

我没怎么旅游过，但是，在我离开美国前，去过大峡谷和三藩市。

4. By the time you finish studying the verb tense tutorial, you _____________(master) all twelve tenses including their passive forms.

等你修完了动词时态训练这门课，你就掌握了所有的十二种时态。

5. Drive faster! If you don't hurry up, she _____________(have) the baby by the time we get to the hospital.

快点开！如果你不快点，她可能在我们到达医院前就要生了。

6. I came to England six months ago. I started my economics course three months ago. When I return to Australia, I _____________(study) for nine months and I _____________(be) in England for exactly one year.

我六个月前到了英国。三个月前开始学习经济学。当回到澳大利亚的时候，我学习了九个月，在英国呆了一年时间。

7. Margie just called and said she would be here at 8 o'clock. By the time she gets here, we _____________(wait) for her for two hours.

玛姬刚打电话来说她八点到，等她到了，我们都等了她两个小时了。

8. Frank just changed jobs again. If he keeps this up, he _____________(change) jobs at least four or five times by the end of the year.

法兰克又换工作了。如果他一直这样下去，他今年年底前就换过4、5次工作了。

9. Come over to my house around 9 o'clock. By then, I _____________(complete) my history essay and we can go see a movie.

9点的时候来我家吧。那个时候我就写完了历史论文，然后我们去看电影吧。

10. In June, my grandmother and grandfather _____________(be) married for fifty years. 

今年六月，我爷爷奶奶就结婚50周年了。