Use Present Perfect or Past Simple of the verbs.

1. A:Why aren’t you doing your homework?
B:I can’t do it. I ... my books at school.
2. A:You ever ... to America?
B:Yes, I ... . I ... there twice.
A:When ... you there?
3. A:There isn’t any milk left. We ... it.
B:I can’ believe it. Yesterday I ... 3 litres.
4. A:They haven’t got a car any more. They ... it.
B:When they ... it?