Fill in the blanks with the simple past tense of the verbs in parentheses.

Here are the sentences with the blanks filled in using the simple past tense:

1. My uncle visited us this weekend.
2. I listened to music with my friends.
3. We studied hard for the exam, so we answered all the questions.
4. Did you finish your homework? No, I didn't finish it.
5. I waited for the school bus but it didn't come.
6. Karen asked for help to finish her homework.
7. You invited them to your party last week.
8. Yesterday night, somebody knocked at the door but I didn't open it.
9. The students walked down the street with their teachers.
10. Something strange happened last night.
11. Tom checked his answers.
12. The postman delivered the letters.