Here are the best answer choices for each sentence based on context:

1. A: Have you **ever** been to London? (never / ever / already / yet)
- Answer: **ever**

2. B: No, I have **never** been there. (never / ever / already / yet)
- Answer: **never**

3. A: Have you seen a UFO?
- B: Yes, I have **already** seen it. It’s amazing. (never / already / yet)
- Answer: **already**

4. A: **How long** have you and Peter been friends? (How long / When / Where)
- Answer: **How long**

5. I haven’t been to Paris **yet**. (already / ever / yet / for)
- Answer: **yet**

6. I have known her **since** I was a child. (since / for / when)
- Answer: **since**

7. I knew her **when** I was a child. (since / for / when)
- Answer: **when**

8. She hasn’t watched any films **recently**. (yesterday / recently / lately / yet)
- Answer: **recently**

9. She didn’t watch any films **since** 2021. (so far / for / since)
- Answer: **since**

10. He has known her **already** (last night / ago / already / yet)
- Answer: **already**

11. I went to bed at 10 o’clock **yesterday**. (2 / never / ever / yet / ago)
- Answer: **yesterday**

12. A: Have you fed the dog?
- B: Yes, I have. I gave it some food two hours **ago**. (never / ever / yet / ago)
- Answer: **ago**

13. They built this house twenty years **ago**. (for / since / one year / ago)
- Answer: **ago**

14. He has written four novels **so far**. (for / since / last year / one year ago)
- Answer: **so far**

15. When did you **last** see him? (recently / already / last / lately)
- Answer: **last**

Feel free to ask if you need further clarification!