Choose the right variant - a/the/--

1. Look at ... blackboard.

2. This ... pen is mine.

3. Yury Gagarin was ... first cosmonaut.

4. There are two ... pictures on ... wall.

5. Pass me ... salt, please.

6. I don't like ... pork.

7. There is ... book on ... table.

8. Where are my ... keys?

9. ... coffee is cold.

10. ... Mississippi is ... longest river in the USA.