1-5 DBDAC6-10 ADCAB 11-15 ACADB 16-17 BB18-20 CDC21-25 CBACB 26-30 CBADA 31-35 CDDBA36-39 BCDB40-43 DAAD44-46 BAC47 C 48-50 ABB51 Could/ May I speak to Professor Johnson 52.May I help you 53.Whats the matter/ trouble/ problem 54.is it serious 55. tell Professor Johnson October 20th is my eighteenth birthday. To celebrate it, we are going to hold a birthday party at home on Saturday evening. The party will start at 7 pm and end at 10 pm, lasting three hours. Would you like to attend my birthday party? I have invited some of my friends and classmates to come. At the party,well sing and dance, followed by a rich dinner. Whats more, well play games together. Im sure we will all enjoy ourselves. Im looking forward to your coming.