1.
Nancy is practicing on the piano. - "on" e in plus
2. It was lucky that we had been decided to buy our tickets in advance. - "been" e in plus
3. We were riding our bikes when suddenly I was felt a pain in my leg. - "was" e in plus
4. We are go camping for three weeks every summer. - "go" e in plus
5. They have planted some new trees last year. - "have" e in plus (nu se foloseste present perfect cu "last year")
6. I suddenly realized I had been walking in the wrong direction. - OK
7. Did you know that Anna has been won a prize? - "has" e gresit, trebuia HAD
8. No one told me that the goods had arrived the week before. - OK