I don't know all, but i'll just answer the one i know.

1. In what series was Mark Kwok named Fred?

2. In what series was Astrid Chan named Grace?

3. What was Margaret Chung’s English name in Dreams of Colors?

4. What was Tiffany Lam’s English name in Net Deception?

5. What was Fiona Yuen’s English name in Healing Hands 2?

6. What was Florence Kwok’s English name in At the Threshold of an Era 1-2?

7. What was Jessica Hsuan’s English name in File of Justice 4-5?

8. What was Patrick Tam’s English name in File of Justice 4-5?

9. What was Michelle Yip’s English name in Reaching Out?

10. What was Sunny Chan’s English name in At the Threshold of an Era?

11. What was Kwok Fung’s English name in At the Threshold of an Era 1-2?

12. What was Sek Sau’s English name in To Get Unstuck in Time?

updated answers: 

I don't know all, but i'll just answer the one i know.

1. In what series was Mark Kwok named Fred?

Summer Heat

2. In what series was Astrid Chan named Grace?

Healing Hands?

3. What was Margaret Chung’s English name in Dreams of Colors?

Donna

4. What was Tiffany Lam’s English name in Net Deception?

Erica

5. What was Fiona Yuen’s English name in Healing Hands 2?

Suki

6. What was Florence Kwok’s English name in At the Threshold of an Era 1-2?

Sandy

7. What was Jessica Hsuan’s English name in File of Justice 4-5?

8. What was Patrick Tam’s English name in File of Justice 4-5?

9. What was Michelle Yip’s English name in Reaching Out?

Jess

10. What was Sunny Chan’s English name in At the Threshold of an Era?

Bill

11. What was Kwok Fung’s English name in At the Threshold of an Era 1-2?

David

12. What was Sek Sau’s English name in To Get Unstuck in Time?

Thanks to HAHA

updated answers: 

1. In what series was Mark Kwok named Fred?

Summer Heat

2. In what series was Astrid Chan named Grace?

Cold Blood Warm Heart

3. What was Margaret Chung’s English name in Dreams of Colors?

Donna

4. What was Tiffany Lam’s English name in Net Deception?

Erica

5. What was Fiona Yuen’s English name in Healing Hands 2?

Suki

6. What was Florence Kwok’s English name in At the Threshold of an Era 1-2?

Sandy

7. What was Jessica Hsuan’s English name in File of Justice 4-5?

Sam

8. What was Patrick Tam’s English name in File of Justice 4-5?

9. What was Michelle Yip’s English name in Reaching Out?

Jess

10. What was Sunny Chan’s English name in At the Threshold of an Era?

Micheal

11. What was Kwok Fung’s English name in At the Threshold of an Era 1-2?

David

12. What was Sek Sau’s English name in To Get Unstuck in Time?

Herman

Thanks to raviolie!