一道英语完形填空

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个人认为无论学习哪一门科目，都不是可以通过单纯的解释来让人理解的．这就是为什么我们总是强调不断，大量和反复的练习，一方面加深印象，另一方面可以另我们从实践中真正的理解．

daddy,can i learn to play the piano?"sarah asked_?_这里不会_her father,mr white."i will agree with you to have lessons for six weeks.if you play well,you can go on with the lessons.if you don't,i will stop the lessons.""ok"mr white found her a good piano and sarah began her leesons.six weeks after ,sarsh said to mr white"i am glad to play for you" she began to play ,she didn't play well.her father had one of his friends with him.the friend put his hands over his ears when he heard the noise. when sarsh stopped,her father said,"well done,sarah,you can go on with your lessons
sarah ran happily out of the room.the friend turned to him"you've spent a lot of money and time ,but she still plays very badly."he said
mr white said"since she started learning the piano,i've been able to buy five apartments in this building very cheaply.in next six weeks ,i will own the whole building ."

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中文翻译（这个是一则幽默小故事吧）：
萨拉问她的爸爸：“爸爸，我可以学弹钢琴么？”
她爸爸回答说：“可以，你可以先上六个星期的钢琴课，之后如果你能弹得好，我就同意你继续上课。否则你就不能再学琴了。”
萨拉同意了。

六个星期后，萨拉对她爸爸说：“我很乐意为您弹奏一曲”。于是便开始演奏。可她弹得不好，当时萨拉爸爸的朋友也在，每当听到演奏出来的噪音时他便捂住耳朵。
当萨拉演奏结束时，她爸爸表扬了她：“萨拉，你弹得非常好，你可以继续去学弹钢琴了。”
萨拉听到后开心的飞奔出了屋子，可他的朋友非常不解，便问道：“你已经花了大把的时间和金钱，可萨拉依旧演奏的那么糟糕，为什么还要她继续去学呢？”
萨拉的爸爸说道：“自从萨拉学钢琴开始，我已经用非常便宜的价格买下了这栋大楼的五间公寓了，那么，到了六个星期后，我将会拥有整栋大楼了！”

凑活翻译了一下，希望楼主还满意。

题目的选项呢