Correct the mistake

Exercise n1

Each of the sentences below contains a mistake (not necessarily the verb).
Find it and write the correction in the space provided (with the auxiliary and pronoun when necessary).
Then press "Check" to see the correction.
If you need help, you may ask for a hint (?), but you will lose points.
1. I have visited New York two months ago.

2. Anne isn't here at the moment. She's been to London.

3. In your life, how many different countries did you visit?

4. They've opened the new shopping centre last week.

5. How many pages of the book did you read so far this week?

6. When have you bought your car?

7. I've lived in London since 5 years.

8. I've seen that film last Friday.

9. His English improved a lot this year.

10. In his last job, Peter has travelled to Germany every month.

11. Julie has worked here between 2010 and 2012.

12. How many films did you see this month?

13. Linda is here! When has she arrived?

14. Before leaving for Boston, I have bought a good dictionary.

15. The annual dinner party will be next week but so far I didn't receive a reply to my invitation.