Here are the correct answers for each of the blanks:

1. **D. but** - He wants to go to the park, **but** he needs to finish his homework first.
2. **D. went** - They **went** to the zoo last weekend.
3. **A. under** - The cat is hiding **under** the bed.
4. **A. some** - She doesn't have **some** friends.
5. **C. the** - She wants to buy **the** new dress for the party.
6. **B. but** - I wanted to go to the concert **but** my parents insisted on going to the movie.
7. **A. under** - The keys are **under** the table.
8. **D. but** - I enjoy reading, **but** I also like watching movies.
9. **D. worst** - It was the **worst** day of my life.
10. **C. finished** - If she **finished** her homework, she can watch TV.
11. **D. over** - The cat is jumping **over** the fence.
12. **C. most delicious** - It was the **most delicious** cake I've ever tasted.

Let me know if you need further assistance!