1. He brought his radio to the beach.

at the beach
 2. They have been married to each other for five years.
man and woman
 3. He walks to school every day. After school he walks home.
school

 4. He’s listening to the ocean in this shell.

listening

 5. George rode to town on his horse.

(note: this is different from saying "to the town." He rode to town. This is the town he lives near, and he visits it regularly.)

riding

 6. This is the entrance to Rudolph’s house.

entrance

 7. He needs to write a letter to his aunt, but he doesn’t know what to write.

(note: the other uses of "to" are in the form of infinitives–not prepositions.)

What are infinitives? Click here and then come back.
school

 8. Last year we took a trip to New York.

statue of liberty

 9. Next year we hope to go to Venice.

venice
 10. If you walk all the way to the top of this hill, you are in very good shape.
top of the hill
 11. He needs to bring his cat to the vet. trip to the vet
 12. This student didn’t pay attention to the teacher and now he doesn’t know what to do. not paying attention