1 . 请从方框内的选项中选出填入下列各句空格的最佳选项，选项可以重复使用。

A. that       B. where       C. when       D. how       E. what       F. why       G. who

1. I asked her ______ she smiled at me that day.
2. I don’t know ______ she has done to her family.
3. Besides, ______ farmers were working, they were keeping fit at the same time.
4. I want to give the white rose to my teacher, ______ has taught me that there is no success without effort.
5. The reason why English is spoken everywhere is ______ in the nineteenth century, English became the language of world trade.

3 . ________is that I have a problem in respect of the writing style. (我给你写这封信的原因) (根据汉语提示完成句子)