用an造句？

1. He was paid seven dollars an hour.他每小时的工资是七元。2. It took us an hour and a half to finish the job.我们花了一个半钟头才做完。3. Stan is an old friend of mine.斯坦是我的一位老朋友。4. An American student wants to see you.一位美国学生想见你。Il traite en...