A: What __? (did you do/do you do/are you doing)
B: I'm a doctor. But __ at the moment. (I'm not working/I don't work/I haven't worked)
A: __ Mrs. Smith yet? (Did you phone/Do you phone/Have you phoned)
B: Yes, I __ it last week. (have done/did/was doing)
A: __ at home when I called you yesterday? (Were you being/Have you been/Were you)
B: No, I __ with my dog. (walked/was walking/has walked)
A: So, what __ two days ago? (happened/was happening/had happened)
B: I couldn't open the door, because I __ the keys at home. ('d forget/'d forgotten/forgot)
A: __ that sandwich in the fridge? (Are you going to eat/Are you eating/Do you eat)
B: No, I'm full.
A: __ it then. (I'm going to eat/I'll eat/I eat)