-I didn't know this was a one-way street, officer.
I soon found that the work I was doing had already been done by someone else —__________ I was wasting time.
__________ with foreign countries can bring us much information about the world.
—Have you known Dr. Jackson for a long time?—Yes, since she________ the Chinese Society.
You may depend on __________ that they will be there on time.
The old custom __________ an old country in Europe.