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