8, A-less the call could be traced to his own address

9, A-so that there may be a heavy fall of snow in the night

10, C-so that the government can discuss the latest crisis

11, A-too high for me to reach

12, A-so that he learns English

13, B-for them to go to the party

14, A-so that the children wouldn't find it

15, A-I tried to study English well so that I can get a good job

16, B-They whispered so that no one could hear them

17, A-We preserve natural resources so that we can use them in the future

18, B-in order that his students can understand it

19, A-rich enough to buy