Choose the correct form of the verb: 1. I have never been/never was to the USA. I have wanted/wanted to go there last summer but I couldn't. 2. He has decided /decided to have a party the other day. 3. His father has already come back / already came back to London. 4. Yan has written / wrote a letter to Nick two days ago. 5. He has sent / sent his letter yesterday. 6. They just bought / have just bought some postcards, 7. Have you ever worked / Did you ever work in a shop? 8. I've already seen / already saw "Shrek". 9. The dog went / has gone to sleep an hour ago. 10. I finished / have finished my homework. Can I go out now?