Choose the correct answer

1. A: You're new here, aren't you?
B: Yes. I started work here yesterday.
A: Ah. Well, you've met everyone in the office, hadn't you/haven't you?
B: Yes. There are a lot of people working here, aren't they/aren't there?

2. A: You will remember to lock all the doors when you leave, will you/won't you?
B: Of course. I'm not stupid, am I/aren't I?
A: No. But you forgot to lock the doors last week, didn't you/did you?
B: You are not going to let me forget that, aren't you/are you?

3. A: You haven't seen Linda lately, have you/haven't you?
B: I saw her today. I told you, did I/didn't I?
A: Oh yes! She didn't mention the party, did she/didn't she?
B: No, she didn't. It's tomorrow night, is it/isn't it?