They caught the elephant again. → The elephant, She bought the watch at the shop. + The watch, They built the house in 1950. → The house, We did the exercises last week. → Exercises, The pupils sent the letters the day before ..

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2. They caught the elephant again. → The elephant.
3. She bought the watch at the shop. + The watch.
4. They built the house in 1950. → The house.
5. We did the exercises last week. → Exercises.
6. The pupils sent the letters the day before yesterday. → The letters.