Choose the underlined part in each sentences (A, B, C or D) that needs correcting

Here are the corrections for the underlined parts in each sentence:

1. **D** (was cooking) - No correction needed.
2. **C** (catching) - Should be "caught."
3. **D** (buys) - Should be "bought."
4. **B** (is looking) - No correction needed.
5. **B** (was sat) - Should be "sat."
6. **D** (delete) - Should be "deleted."
7. **D** (do we) - Should be "so are we."
8. **B** (has told) - Should be "told."
9. **D** (stop) - Should be "stopped."
10. **C** (has been playing) - No correction needed.

So, the corrections are:
1. D
2. C
3. D
4. B
5. B
6. D
7. D
8. B
9. D
10. C