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— May I go to the concert with you?

— I’m afraid not ____ you have a ticket, because I have only one.

A. since　　 B. if　　 　 C. unless　　 　 D. though

–May I go to the concert with you?

– I’m afraid not ______you have a ticket, because I have only one.

A. since        B. if        C. unless    D. though

— May I go to the concert with you?

   — I’m afraid not ______ you have a ticket, because I have only one.

A. unless                    B. since                    C. if                     D. though

-May I go to the movies with you ?

-I’m afraid not　　 you have a ticket, because I have only one.

　　　 A. if　　　　　　　 B. unless　　　　　　　　 C. though

 ——May I go to the theatre with you?  

—— I’m afraid not ____ you have a ticket, because I have only one.

A. since                  B. if                             C. unless                      D. though