Английский,помогите!70б

1. Nina sent Olga several text messages last night.2. Viktor is going to recycle his old computer. He has had it for over 10 years.3. Have you ever used Flickr to share photographs?4. We had a great time playing video games at Vasily's house last night.5. Anna's mum bought a new mobile phone yesterday.6. I haven't received a reply from the university yet.7. Nika has been on the Internet since this morning.8. How many emails have you sent so far today?9. Have you ever had an accident while text messaging?10. Last Monday I left the library at about 4:30 pm.