1. This is the house in which we stay this summer.

2. I’ll show you the second hand bookshop in which you can find valuable books.

3. I have not decided the day when I’ll go to London.

4. He was born on the day when his father was away.

5. The book which we can look up telephone numbers is a telephone directory.

6. Mrs. Brown is a very good doctor who is carrying out an urgent operation now.

7. The airport at which we’re going to arrive is the most modern one.

8. She doesn’t want to speak of the cause which she divorced her husband.

9. The days when I lived far from home were the saddest ones.

10. I never forget the park at which we met each other for the first time.

1.This is the house. We often stay in this house in summer.

⇒This is the house where we often stay in summer.

2.I’ll show you the second hand bookshop. You can find valuable books in this shop.

⇒I'll show you the second-hand bookshop where you can find valuable books.

3.I have not decided the day. I’ll go to London on that day.

⇒I haven't decided the day when i'll go to london.

4.. He was born on the day. His father was away on that day.

⇒He was born on the day when his father was away.

5.The book is a telephone directory. We can look up telephone numbers in this book.

⇒The book in which we can look up telephone numbers is a telephone directory.

6.Mrs. Brown is a very good doctor. She is carrying out an urgent operation now.

⇒Mrs.brown rang Dr. brown when he was going to carry out an urgent operation.

7.The airport is the most modern one. We’re going to arrive at this airport.

⇒The airport where we’re going to arrive is the most modern one.

8.She doesn’t want to speak of the cause. She divorced her husband of this cause.

⇒She doesn’t want to speak of the cause why she divorced her husband.

9. The days were the saddest ones. I lived far from home on those days.

⇒The days when I lived far from home were the saddest ones.

10.I never forget the park. We met each other for the first time at this park.

⇒I never forget the park where we met each other for the first time.

Xin ctlhn!Chúc bạn hok tốt🥰