1 . 我经常花很多时间在网上和我的朋友聊天，以至于我的父母担心我的学习。(so...that...)
I often ________ ________ ________ ________ chatting with my friend on the Internet ________ my parents worry about my study.

2 . There are ___ I don’t know which to choose.   
有那么多有趣的书，我不知道该选哪本了。

3 . It is ___ I can see the fishes in it.  
水如此清澈以至于我都能看见里面的鱼。

4 . 他进步如此快，以至于老师们对他感到很满意。
He has made ______the teachers are very satisfied with him.

5 . 现在的人们太忙，以至于他们似乎不可能抽出时间在家准备一顿饭。
Nowadays, people are ________it seems impossible for them to spare time to prepare a meal at home.

6 . 这里的风景是如此美丽，所以我决定再待一天。
The scenery here is ________ I’ve decided to stay another day.

7 . 他一直努力学习英语，所以他能在谈判中表现出色。
He has been learning English ________in the negotiation.

8 . 那时我很忙,以至于三天没睡觉。(so...that...)
I ________I didn’t go to sleep for three days.

9 . 他很聪明，能把那么难的一个问题解出来。(so...that...)
He is ________ ________ ________ he could work out such a difficult problem.

10 . 起初我有些紧张，但是每个人都如此友好，以至于我很快让自己冷静了下来。(so...that...)
I was a little nervous at first, but everyone was ________ I soon calmed myself down.