1.I don't know the name of the woman whom I spoke to  on the phone

2.We often to go visit our friend in Bristol which is 30 miles away

3.This is Mr Carter about whom I was telling you 

4. That is the room where the meeting is held

5. I will always remember the days on when I first saw that sight 

1 i don't know the name of the woman. I spoke to her on the phone.
I don't know the name of the woman whom I spoke to  on the phone

2 We often go to visit our friends in Bristol. It's only 30 miles away.
we often to go visit our friend in Bristol which is 30 miles away

3 This is Mr Carter. I was telling you about him.
This is Mr Carter about whom I was telling you 

4 That is the room. The meeting is held in that room.
that is the room where the meeting is held

5 I'll always remember the day. I first saw that sight on that day.
I will always remember the days on when I first saw that sight 

6 She was born in Malaysia. Rubber trees grow well there.
She was born in Malaysia where rubbers tree grow well

7 No one knows the school. My uncle taught at that school 10 years ago.
No one know the school  at which my uncle taught 10 years ago

8 Please ask them the time. The train started the trip at that time.
Please ask them the time at when the train started the trip

9 New Year's Day is a day. All family members gather and enjoy a family dinner then.
New year's day is a day when all family members gather and enjoy family dinner

10 There are many hotels. Tourists can enjoy their holidays there.
there are many hotels where tourist can enjoy their holidays