6b so that she can

7c so as not to

8a so that

9d so as not to

10d so that

11c so as not to

12c will

13b so as to

14c in

15d to

16b doesn't

17d in order 

18a to learn

19a I spoke slowly so that the foreigner could understand me

20b so that his students could understand it

II.1 the boy stood on the desks so that they could get a better view

2 we learn english so as to have better communication with other people

3 we lower the volume in order not to bother our neighbors

4 I will write to you so that you know my decision soon

5 these girls were talking whispers so as not to want anyone to hear their conversation

6 I spoke loudly in order that everybody could hear me clearly 

7 mary often goes home as soon as the class is over so that her mother doesn't wait for her 

8 Tom gets up early so as not to be late for school

22c many accidents are caused by dangerous driving

23a bicycles must not be left in the hall

24c when I arrived the room was being cleaned

25c he would have passed the exam if he had worked hard

26d would have failed

27c had known

28c if his car weren't broken peter could go out for lunch

29b for

30c concern

31a to live

32d where