1) A: Would you like something to eat?
   B: No, thanks. I **have just had** lunch.

2) A: Do you know where Julia is?
   B: Yes, I **have just met** her in the street.

3) A: What time is he going?
   B: He **has already gone**.

4) A: What's in the newspaper today?
   B: I don't know. I **haven't read it yet**.