Use Relative adverb to combine each pair of sentences below: 1. This is the house. We often stay in this house in summer. ......................................................................................................................................... 2. I’ll show you the second-hand bookshop. You can find valuable books in this shop. ......................................................................................................................................... 3. I have not decided the day. I’ll go to London on that day. ......................................................................................................................................... 4. He was born on the day. His father was away on that day. ......................................................................................................................................... 5. The book is a telephone directory. We can look up telephone numbers in this book. ......................................................................................................................................... 6. Mrs. Brown rang Dr. Brown. He was going to carry out an urgent operation at that moment. ......................................................................................................................................... 7. The airport is the most modern one. We’re going to arrive at this airport. ......................................................................................................................................... 8. She doesn’t want to speak of the cause. She divorced her husband because of this cause. ......................................................................................................................................... 9. The days were the saddest ones. I lived far from home on those days. ......................................................................................................................................... 10. I never forget the park. We met each other for the first time at this park.