1. He stood on the hill with his arms crossed.

2. She sleeps with one eye open.
3. Don't talk with your mouth full.
4. He is walking with a baseball in his hand.
5. He was reading a book with his wife knitting beside him.
6. She worked in the living room with her husband sleeping by her.
7. He was sitting in the room with his legs crossed.
8. He was sitting in the room with his hands raised high.
9. He was sitting in the room with his mouth open.
10. He was sitting in the room with his right hand moving.
[Would you check the sentences? Correct any errors, please. Thank you.]

All are fine!

=)

The sentences are grammatically correct. There are no errors in the sentences as they all follow standard English grammar and structure.