Complete the dialogue with the correct form of the verbs given.
A: Hi, Petra! What (1) …………………………………………… (do) here?
B: I (2) …………………………………………… (wait) for Pete.
A: Oh. I (3) …………………………………………… (see) him five minutes ago. He (4) …………………………………………… (stand) in the entrance of the cinema.
B: Well, I (5) …………………………………………… (not understand) it. He arranged to meet me here.
(1) are you doing
(1) do you do
(1) did you do
(1) were you doing