Combine each pair of sentences into one, using a suitable Relative Pronoun

Combine each pair of sentences into one, using a suitable Relative Pronoun
48. London is a big city. We spent our vacation there.
49. The room is very nice. I’m living in that room.
50. We have not decided the day. We’ll go to London on that day.
51. The school is smaller than mine. You work here.
52. The place was really beautiful. We spent our holiday there.
53. The book is a telephone dictionary. We can look up telephone number in this book.
54. Do you know the time? You met her at that time.
55. The day is so boring to me. We don’t meet each other on that day.