1过去式：cost
过去式题目：
1. The book _cost_(cost) him 10 yuan yesterday. 这本书花了他10元钱。
2. The mirror which he broke yesterday didn't _cost_(cost) much. 他昨天打破的镜子不值多少钱。
3. It _cost_(cost) me five yuan to buy a dictionary yesterday. 昨天我花了五块钱买了一本字典。
4. Yesterday I bought a laser printer _cost_(cost) 1460 yuan which is made by HP. 昨天，我花了1460元钱买了台惠普激光打印机。
2过去分词：cost
过去分词题目：
1. The down economy had _cost_(cost) us a lot of jobs, and state revenue was too meager to allow anything to be done for education. 不景气的经济已经使州内很多人失业，而州里的税收收入又少，我们没有能力对教育进行改善。
2. Hastings' route had _cost_(cost) them 18 valuable days. 黑斯廷斯这条路耗费了他们宝贵的18天时间。
3. If he had known what it had _cost_(cost) me to acquire my art, he would also have known that it would break any collector to buy it. 要是他知道我花费多少精力习得这门语言，那他一定得知道任何收藏家倾家荡产都难买到我这一藏品。
4. Recalling how much it had _cost_(cost), it was said the novice gained "a good footing". 当回顾这花销了多少钱时，被说成是初学者得到了“良好的基础”。
5. Then I looked at Hanna's handwriting and saw how much energy and struggle the writing had _cost_(cost) her. 这时我看着汉娜的手迹，看到那笔迹耗费了她多大的精力和努力啊。
