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Hi Yun Chae! Thank you for doing your homework, I appreciate it a lot!  ^ ^

All of your sentences are correct, only the instruction asks for past progressive in the negative form. That means simply adding \"not\" in all of your sentences. ^ ^ Be careful next time. Knowing how to read and follow instructions well is important. ^ ^

-Teacher Jedah

1. you / to the radio / listen
- You were listening to the radio.

>>You were not listening to the radio.
2. the teacher / our English / test
- The teacher was testing our English.

>>The teacher was not testing our English.
3. we / in the mountains / walk
- We were walking in the mountains.

>>We were not walking in the mountains.
4. they / a race / run
- They were running a race.

>>They were not running a race.
5. she / in a play / act
- She was acting in a play.

>>She was not acting in a play.
6. Sally / to school / hurry
- Sally was hurrying to school.

>>Sally was not hurrying to school.
7. Benjamin / the rules / break
- Benjamin was breaking the rules.

>>Benjamin was not breaking the rules.
8. my sister / our dog / feed
- My sister was feeding our dog.

>>My sister was not feeding our dog.
9. the teacher / to the board / point
- The teacher was pointing to the board.

>>The teacher was not pointing to the board.
10. his mother / dinner / cook
- His mother was cooking dinner.

>>His mother was not cooking dinner.