It was about 600 years ago _____ the first clock with a face and an hour hand was made .
Not until he arrived home _____ he find that this wallet had been stolen.
This city, ______ lies in the northeast, was the country’s busiest port from 1648 to 1950.
At least 200,000 people were reported ______ in the ever recorded worst earthquake that struck Haiti that winter.
One advantage of eating a balanced breakfast is ______ it can keep you energetic throughout the day.
We often talk a great deal about English language teaching, ______ that it is the learning that really matters.