24. The Niagara Waterfalls, ______ is shaped like a semicircle, are 670meters wide, and fall 56 meters in an awesome white sheet of water.
— Sally, our monitor, was late for her class this morning. — ______? As far as I know, she never came late to class.
Every year, Tom remembers to have some flowers ______to her mother on her birthday.
Nanjing is ______ beautiful city, where you can see ______ famous Changjiang River.
_________. It’s high time we left for the airport.
More and more high-rise buildings have been built in big cities ________ space. A. in search of B. in place of C for lack of D. in memory of