20. In the past ten years, great changes _______ in my hometown.
--- Did -you catch the early bus yesterday?--- No,it _________ by the time I _________ the bus station.
The man_________at the meeting is a very famous writer.
After you have written your ending, _________it _________your classmate's.
If you are_________about the Pyramids in Egypt,just read the book written by Dr Johnson.
---Do you mind if I keep pets in this building?---_________