45. Look! The children ______ (plant) flowers in the garden. 46. I ____________ (know) the place for many years.
47. Where is my pen? How strange! It ____________ (be) here just a moment ago. 48. He _________ (give) the book back to you if he _____ (finish) reading it tomorrow.
49. Mr. Dong often ____________ (meet) up with his friends in the new park.
50. How long _____ you ______ (live) in Nanjing since you were ________ (bear)? 51. They only __________ (meet) once. But they were __________ (like) old friends.