Here are the completed sentences with the correct form of the verbs:

1. You (visit) **have visited** any famous museums?
2. They (not/sign) **did not sign** this contract yet.
3. She (never/speak) **has never spoken** to her neighbor.
4. We (just/finish) **have just finished** our test in English.
5. They (already/go) **have already gone** to the swimming pool.
6. I (not/buy) **have not bought** a new car yet.
7. You (wash) **have you washed** these dishes?
8. You (check) **have you checked** your homework?
9. You (ever/touch) **have you ever touched** the crocodiles?
10. She (drink) **has drunk** apple juice today.
11. He (dance) **has danced** since 5 o'clock.
12. How long you (study) **have you studied** Spain? – I (study) **have studied** for 3 months.
13. Jenifer (drink) **has drunk** two cups of tea this morning.

Feel free to ask if you have any more questions!