By the time I pay off all the money that I borrowed from the bank when I bought my house, I will have been ________.
In order to catch up with her classmates, _____.
—Do remember to watch out for cars while crossing the street. —_____.
—_____ that he picked up his uncle at the airport? —It was at 6:00 in the afternoon _____ he got off work.
Fans from miles around crowded into the stadium for the concert of Jay Chou on September 4th, 2012, _____ are popular with teenagers.
—Why does Mary look so worried today? —I’m not sure, but she _____ a small accident driving here.