"10 предложений present perfect simple"

1.Clementine has cooked dinner.
2. I have never been to Sweden
3. I have lost my key
4.We have bought a new table
5. Have you been at school?
6.Has he spoken to his boss?
7.He haven't worked today
8.We haven't planned our holiday yet
9.Mark has written six letters 
10.Where have you been?