1--5 DBDAC
6--10 ADCAB 11--15 ACADB 16--17 BB
18--20 CDC
21--25 CBACB 26--30 CBADA 31--35 CDDBA
36--39 BCDB
40--43 DAAD
44--46 BAC
47 C 48--50 ABB
51 Could/ May I speak to Professor Johnson 52.May I help you 53.What’s the matter/ trouble/ problem 54.is it serious
55. tell Professor Johnson