跟读：
It was closed because it was too expensive to operate.
Line graphs are very good at showing how things change over time。
Tourists can reach the island by boat from the city
When the traffic is really heavy, his commute is stressful.
When he went out,he loved to be the center of attention.
She works an average of 8 hours a day, which is one third of her day.
These applicants were between 20 and 25 years old.
They will support and protect their leaders and friends.
An invoice lists the prices and products being bought.
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