He wrote a letter ___he explained what had happened in the accident.
Was it when you were attending high school _________you first listened to pop music?
All Hangzhou drivers are required to _________ the departments of traffic control of any changes in their personal information.
When we got there, he was about to leave. So he only had time to explain _______ to us how he ________ our plan.
Later in this chapter cases will be introduced to readers_________ consumer complaints have led to changes in the law.
Sometimes people have no belief ________ his choices about their eating habits.