(2014届湖南省怀化市高三第一次模拟考试英语试卷) We used to mistake that heavy objects fell faster than light .
Father made a promise ___ I passed the examination he would buy me an MP6 player.
There are so many viruses on the Internet. If ____ accidentally, the viruses may make your computer break down.
In front of our house _______ we used to swim.
We were finally able to make the customers _______ of the quality of the refrigerator.
He expects to _______ the business when his father retires.