2 . I did not understand all of the traditional customs, but a few made a deep impression on me. One was the bridegroom’s entrance on a beautiful white horse. I had never seen that back home! Another was the part when Nadim’s father proudly led his daughter through the rows of seats to her husband. It reminded me of my sister’s wedding. ________________.（根据句意填空）

3 . The final proof came when an enormous shipyard was discovered in Nanjing, ______ the fleet had been built. （根据句意填空）

4 . We must know all these, if the book is to speak its whole message. ________.（根据句意填空）