2. Fill in the article (a/an, the) where it’s necessary. 1. … Mark Twain is famous for his book “The Adventures of Tom Sawyer” 2.  … Smiths have … dog and … cat. 3. “Is this your ... friend?” — “No, it isn’t my ... friend, it i...

2. Fill in the article (a/an, the) where it’s necessary. 1. … Mark Twain is famous for his book “The Adventures of Tom Sawyer” 2.  … Smiths have … dog and … cat. 3. “Is this your ... friend?” — “No, it isn’t my ... friend, it is my sister”. 4. This is ... tree. ... tree is green. 5. I can see three ... children. ... children are playing in … yard. 6. What's … highest mountain in the world? 7. He lives in … Paris. 8. He is  … economist. 9. … Earth goes round … Sun. 10. What … strange girl! 11. Could you close … door, please? 12. We celebrate  New Year on … 31st of … December. 13. It is washed by the waters of … Atlantic Ocean. 14. Are you studying foreign languages at school, like … French? 15. … Moscow is on … Moskva River.