1. I've lost my key. I can't find it. - RIGHT
2. Have you seen Ann yesterday? - WRONG: Did you see Ann yesterday?
3. I've finished my work at 2 o'clock. - RIGHT
4. I'm ready now. I've finished my work. - RIGHT
5. What time have you finished your work? - RIGHT
6. Sue isn't here. She's gone out. - RIGHT
7. Jim's grandmother has died in 1989. - WRONG: Jim's grandmother died in 1989.
8. Where have you been last night? - RIGHT