1.  A. Patient and doctor.     

B. Waitress and customer.

C. Wife and husband.     

D. Secretary and boss.

2.  A. A concert.  B. A hotel.   

C. A restaurant.   D. A bank. 

3.  A. At 10.   B. At 10:30.   

C. At 11.     D. At 11:30.