6. Put in the right preposition.

1. The task requires filling in prepositions for given sentences.
2. Sentence 1: 'arrived at the airport'.
3. Sentence 2: 'goes to work by bus'.
4. Sentence 3: 'birthday is on the 4th of October'.
5. Sentence 4: 'bought this house in 1999'.
6. Sentence 5: 'park in front of my house'.
7. Sentence 6: 'library is on the right'.