参考答案:
1. Before I got to the bus stop, the bus had already left.
2. By the time I got to school, the class had been on for five minutes.
3. I was about to go up when I decided to get a coffee first.
4. As I was waiting in line with other office workers, I heard a loud sound.
5. by the time I got to the airport, my plane to New Zealand had already taken off.
6. The next morning, I heard about the earthquake in New Zealand the day before.
7. April Fool's Day is a day when many people play all kinds of tricks and jokes on each other.
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