Sure! Here are the completions for the sentences in the exercise:

**Exercise 3:**
1. Mr. Smith asked where you were going on your vacation that year.
2. She asked if the mechanics had finished repairing her car.
3. She asked why David had been looking so miserable lately.
4. I asked my friend if anyone had been hurt in the car accident the previous month.
5. She asked me how old I was at that time.
6. He said to her if she had been to town that day.
7. She asked her if she had been there at that time.
8. John asked Mary how long it took her to get to London.
9. Mr. Green asked his secretary who she had talked to a few minutes ago.
10. Paul asked Mary if she could swim.
11. He asked where he could find her in that town.
12. She asked her son if he knew which cup he had used.

**Exercise 4:**
1. She said he worked in a bank.
2. She said they had gone out the previous night.
3. She said she was coming.
4. She told me she had been waiting for the bus when he arrived.
5. She said she had never been there before.
6. She said she hadn’t gone to the party.
7. She told me Lucy would come later.
8. She told me he hadn’t eaten breakfast.
9. She said she could help me the next day.
10. She said I should go to bed early.

Feel free to ask if you need any additional help!