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: Have you ever been to America?
B: Yes, I ... . I ... there twice.

A: When  **\.\.\.**  you there?  

B: For the first time I  **\.\.\.**  there in 1998\.  

3. A: There isn't any milk left. We ... it.
B: I can't beliave it. Yesterday I ... 3 litres.

4. A: They haven't got a car any more. They ... it.

B: When they  **\.\.\.**  it?  

5. A: Have you found your pen?
B: Yes, I ... . I ... it last Tuesday.